Filtering void utf8

I have a message documents in an unidentified or combined encoding. I intend to see the lines which contain a byte series that is not legitimate UTF - 8 (by piping the message documents right into some program). Equivalently, I intend to remove the lines that stand UTF - 8. To put it simply, I'm seeking grep [notutf8].

An excellent remedy would certainly be mobile, brief and also generalizable to various other encodings, yet if you really feel the most effective means is to cook in the definition of UTF-8, proceed.

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2019-05-18 23:19:07
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Answers: 2

Edit : I've dealt with a typo - bug in the regex. It required a '\x80' not \80 .

The regex to remove void UTF - 8 kinds, for rigorous adherance to UTF - 8, is as adheres to

perl -l -ne '/
 ^( ([\x00-\x7F])              # 1-byte pattern
   |([\xC2-\xDF][\x80-\xBF])   # 2-byte pattern
   |((([\xE0][\xA0-\xBF])|([\xED][\x80-\x9F])|([\xE1-\xEC\xEE-\xEF][\x80-\xBF]))([\x80-\xBF])) # 3-byte pattern
   |((([\xF0][\x90-\xBF])|([\xF1-\xF3][\x80-\xBF])|([\xF4][\x80-\x8F]))([\x80-\xBF]{2}))       # 4-byte pattern
  )*$ /x or print'

Output (of key lines.from Test 1 ) :

Codepoint
=========  
00001000  Test=1 mode=strict               valid,invalid,fail=(1000,0,0)          
0000E000  Test=1 mode=strict               valid,invalid,fail=(D800,800,0)          
0010FFFF  mode=strict  test-return=(0,0)   valid,invalid,fail=(10F800,800,0)          

Q. How does one create examination information to examine a regex which filterings system void Unicode?
A. Create your very own UTF - 8 examination algorithm, and also damage it is regulations ...
Catch - 22. Yet after that, just how do you after that examine your examination algorithm?

The regex, above, has actually been examined (making use of iconv as the reference) for every single integer value from 0x00000 to 0x10FFFF. This upper value being the maximum integer value of a Unicode Codepoint

According to this wikipedia UTF-8 web page,.

  • UTF - 8 inscribes each of the 1,112,064 code factors in the Unicode personality set, making use of one to 4 8 - little bit bytes

This numeber (1,112,064) relates to an array 0x000000 to 0x10F7FF, which is 0x0800 reluctant of the real maximum integer - value for the highest possible Unicode Codepoint : 0x10FFFF

This block of integers is missing out on from the Unicode Codepoints range, as a result of the demand for the UTF - 16 inscribing to tip past its initial design intent using a system called surrogate pairs. A block of 0x0800 integers has actually been booked to be made use of by UTF - 16. This block extends the range0x00D800 to 0x00DFFF. None of these inteters are lawful Unicode values, and also are consequently void UTF - 8 values.

In Test 1 , the regex has actually been examined versus every number in the series of Unicode Codepoints, and also it matches exectly the outcomes of iconv. ie. 0x010F7FF legitimate values, and also 0x000800 void values.

Nonetheless, the concern currently emerges of, *How does the regex take care of Out - Of - Range UTF - 8 Value ; over 0x010FFFF (UTF - 8 can include 6 bytes, with a maximum integer value of 0x7FFFFFFF?
To create the essential * non - unicode UTF - 8 byte values , I've made use of the adhering to command :

  perl -C -e 'print chr 0x'$hexUTF32BE

To examine their legitimacy (in some style), I've made use of Gilles' UTF - 8 regex ...

  perl -l -ne '/
   ^( [\000-\177]                 # 1-byte pattern
     |[\300-\337][\200-\277]      # 2-byte pattern
     |[\340-\357][\200-\277]{2}   # 3-byte pattern
     |[\360-\367][\200-\277]{3}   # 4-byte pattern
     |[\370-\373][\200-\277]{4}   # 5-byte pattern
     |[\374-\375][\200-\277]{5}   # 6-byte pattern
    )*$ /x or print'

The result of 'perl is print chr' matches the filtering system of Gilles' regex. One enhances the legitimacy of the various other. I can not make use of iconv due to the fact that it just takes care of the legitimate - Unicode Standard part of the more comprehensive (initial) UTF - 8 typical ...

The nunbers entailed are instead huge, so I've examined leading - of - array, lower - of - array, and also numerous scans tipping by increments such as, 11111, 13579, 33333, 53441... The outcomes all suit, so currently all that continues to be is to examine the regex versus these out - of - array UTF - 8 - design values (void for Unicode, and also consequently additionally void for rigorous UTF - 8 itself).


Below are the examination components :

[[ "$(locale charmap)" != "UTF-8" ]] && { echo "ERROR: locale must be UTF-8, but it is $(locale charmap)"; exit 1; }

# Testing the UTF-8 regex
#
# Tests to check that the observed byte-ranges (above) have
#  been  accurately observed and included in the test code and final regex. 
# =========================================================================
: 2 bytes; B2=0 #  run-test=1   do-not-test=0
: 3 bytes; B3=0 #  run-test=1   do-not-test=0
: 4 bytes; B4=0 #  run-test=1   do-not-test=0 

:   regex; Rx=1 #  run-test=1   do-not-test=0

           ((strict=16)); mode[$strict]=strict # iconv -f UTF-16BE  then iconv -f UTF-32BE beyond 0xFFFF)
           ((   lax=32)); mode[$lax]=lax       # iconv -f UTF-32BE  only)

          # modebits=$strict
                  # UTF-8, in relation to UTF-16 has invalid values
                  # modebits=$strict automatically shifts to modebits=$lax
                  # when the tested integer exceeds 0xFFFF
          # modebits=$lax 
                  # UTF-8, in relation to UTF-32, has no restrictione


           # Test 1 Sequentially tests a range of Big-Endian integers
           #      * Unicode Codepoints are a subset ofBig-Endian integers            
           #        ( based on 'iconv' -f UTF-32BE -f UTF-8 )    
           # Note: strict UTF-8 has a few quirks because of UTF-16
                    #    Set modebits=16 to "strictly" test the low range

             Test=1; modebits=$strict
           # Test=2; modebits=$lax
           # Test=3
              mode3wlo=$(( 1*4)) # minimum chars * 4 ( '4' is for UTF-32BE )
              mode3whi=$((10*4)) # minimum chars * 4 ( '4' is for UTF-32BE )


#########################################################################  

# 1 byte  UTF-8 values: Nothing to do; no complexities.

#########################################################################

#  2 Byte  UTF-8 values:  Verifying that I've got the right range values.
if ((B2==1)) ; then  
  echo "# Test 2 bytes for Valid UTF-8 values: ie. values which are in range"
  # =========================================================================
  time \
  for d1 in {194..223} ;do
      #     bin       oct  hex  dec
      # lo  11000010  302   C2  194
      # hi  11011111  337   DF  223
      B2b1=$(printf "%0.2X" $d1)
      #
      for d2 in {128..191} ;do
          #     bin       oct  hex  dec
          # lo  10000000  200   80  128
          # hi  10111111  277   BF  191
          B2b2=$(printf "%0.2X" $d2)
          #
          echo -n "${B2b1}${B2b2}" |
            xxd -p -u -r  |
              iconv -f UTF-8 >/dev/null || { 
                echo "ERROR: Invalid UTF-8 found: ${B2b1}${B2b2}"; exit 20; }
          #
      done
  done
  echo

  # Now do a negated test.. This takes longer, because there are more values.
  echo "# Test 2 bytes for Invalid values: ie. values which are out of range"
  # =========================================================================
  # Note: 'iconv' will treat a leading  \x00-\x7F as a valid leading single,
  #   so this negated test primes the first UTF-8 byte with values starting at \x80
  time \
  for d1 in {128..193} {224..255} ;do 
 #for d1 in {128..194} {224..255} ;do # force a valid UTF-8 (needs $B2b2) 
      B2b1=$(printf "%0.2X" $d1)
      #
      for d2 in {0..127} {192..255} ;do
     #for d2 in {0..128} {192..255} ;do # force a valid UTF-8 (needs $B2b1)
          B2b2=$(printf "%0.2X" $d2)
          #
          echo -n "${B2b1}${B2b2}" |
            xxd -p -u -r |
              iconv -f UTF-8 2>/dev/null && { 
                echo "ERROR: VALID UTF-8 found: ${B2b1}${B2b2}"; exit 21; }
          #
      done
  done
  echo
fi

#########################################################################

#  3 Byte  UTF-8 values:  Verifying that I've got the right range values.
if ((B3==1)) ; then  
  echo "# Test 3 bytes for Valid UTF-8 values: ie. values which are in range"
  # ========================================================================
  time \
  for d1 in {224..239} ;do
      #     bin       oct  hex  dec
      # lo  11100000  340   E0  224
      # hi  11101111  357   EF  239
      B3b1=$(printf "%0.2X" $d1)
      #
      if   [[ $B3b1 == "E0" ]] ; then
          B3b2range="$(echo {160..191})"
          #     bin       oct  hex  dec  
          # lo  10100000  240   A0  160  
          # hi  10111111  277   BF  191
      elif [[ $B3b1 == "ED" ]] ; then
          B3b2range="$(echo {128..159})"
          #     bin       oct  hex  dec  
          # lo  10000000  200   80  128  
          # hi  10011111  237   9F  159
      else
          B3b2range="$(echo {128..191})"
          #     bin       oct  hex  dec
          # lo  10000000  200   80  128
          # hi  10111111  277   BF  191
      fi
      # 
      for d2 in $B3b2range ;do
          B3b2=$(printf "%0.2X" $d2)
          echo "${B3b1} ${B3b2} xx"
          #
          for d3 in {128..191} ;do
              #     bin       oct  hex  dec
              # lo  10000000  200   80  128
              # hi  10111111  277   BF  191
              B3b3=$(printf "%0.2X" $d3)
              #
              echo -n "${B3b1}${B3b2}${B3b3}" |
                xxd -p -u -r  |
                  iconv -f UTF-8 >/dev/null || { 
                    echo "ERROR: Invalid UTF-8 found: ${B3b1}${B3b2}${B3b3}"; exit 30; }
              #
          done
      done
  done
  echo

  # Now do a negated test.. This takes longer, because there are more values.
  echo "# Test 3 bytes for Invalid values: ie. values which are out of range"
  # =========================================================================
  # Note: 'iconv' will treat a leading  \x00-\x7F as a valid leading single,
  #   so this negated test primes the first UTF-8 byte with values starting at \x80
  #
  # real     26m28.462s \ 
  # user     27m12.526s  | stepping by 2
  # sys      13m11.193s /
  #
  # real    239m00.836s \
  # user    225m11.108s  | stepping by 1
  # sys     120m00.538s /
  #
  time \
  for d1 in {128..223..1} {240..255..1} ;do 
 #for d1 in {128..224..1} {239..255..1} ;do # force a valid UTF-8 (needs $B2b2,$B3b3) 
      B3b1=$(printf "%0.2X" $d1)
      #
      if   [[ $B3b1 == "E0" ]] ; then
          B3b2range="$(echo {0..159..1} {192..255..1})"
         #B3b2range="$(> {192..255..1})" # force a valid UTF-8 (needs $B3b1,$B3b3)
      elif [[ $B3b1 == "ED" ]] ; then
          B3b2range="$(echo {0..127..1} {160..255..1})"
         #B3b2range="$(echo {0..128..1} {160..255..1})" # force a valid UTF-8 (needs $B3b1,$B3b3)
      else
          B3b2range="$(echo {0..127..1} {192..255..1})"
         #B3b2range="$(echo {0..128..1} {192..255..1})" # force a valid UTF-8 (needs $B3b1,$B3b3)
      fi
      for d2 in $B3b2range ;do
          B3b2=$(printf "%0.2X" $d2)
          echo "${B3b1} ${B3b2} xx"
          #
          for d3 in {0..127..1} {192..255..1} ;do
         #for d3 in {0..128..1} {192..255..1} ;do # force a valid UTF-8 (needs $B2b1)
              B3b3=$(printf "%0.2X" $d3)
              #
              echo -n "${B3b1}${B3b2}${B3b3}" |
                xxd -p -u -r |
                  iconv -f UTF-8 2>/dev/null && { 
                    echo "ERROR: VALID UTF-8 found: ${B3b1}${B3b2}${B3b3}"; exit 31; }
              #
          done
      done
  done
  echo

fi

#########################################################################

#  Brute force testing in the Astral Plane will take a VERY LONG time..
#  Perhaps selective testing is more appropriate, now that the previous tests 
#     have panned out okay... 
#  
#  4 Byte  UTF-8 values:
if ((B4==1)) ; then  
  echo "# Test 4 bytes for Valid UTF-8 values: ie. values which are in range"
  # ==================================================================
  # real    58m18.531s \
  # user    56m44.317s  | 
  # sys     27m29.867s /
  time \
  for d1 in {240..244} ;do
      #     bin       oct  hex  dec
      # lo  11110000  360   F0  240
      # hi  11110100  364   F4  244  -- F4 encodes some values greater than 0x10FFFF;
      #                                    such a sequence is invalid.
      B4b1=$(printf "%0.2X" $d1)
      #
      if   [[ $B4b1 == "F0" ]] ; then
        B4b2range="$(echo {144..191})" ## f0 90 80 80  to  f0 bf bf bf
        #     bin       oct  hex  dec          010000  --  03FFFF 
        # lo  10010000  220   90  144  
        # hi  10111111  277   BF  191
        #                            
      elif [[ $B4b1 == "F4" ]] ; then
        B4b2range="$(echo {128..143})" ## f4 80 80 80  to  f4 8f bf bf
        #     bin       oct  hex  dec          100000  --  10FFFF 
        # lo  10000000  200   80  128  
        # hi  10001111  217   8F  143  -- F4 encodes some values greater than 0x10FFFF;
        #                                    such a sequence is invalid.
      else
        B4b2range="$(echo {128..191})" ## fx 80 80 80  to  f3 bf bf bf
        #     bin       oct  hex  dec          0C0000  --  0FFFFF
        # lo  10000000  200   80  128          0A0000
        # hi  10111111  277   BF  191
      fi
      #
      for d2 in $B4b2range ;do
          B4b2=$(printf "%0.2X" $d2)
          #
          for d3 in {128..191} ;do
              #     bin       oct  hex  dec
              # lo  10000000  200   80  128
              # hi  10111111  277   BF  191
              B4b3=$(printf "%0.2X" $d3)
              echo "${B4b1} ${B4b2} ${B4b3} xx"
              #
              for d4 in {128..191} ;do
                  #     bin       oct  hex  dec
                  # lo  10000000  200   80  128
                  # hi  10111111  277   BF  191
                  B4b4=$(printf "%0.2X" $d4)
                  #
                  echo -n "${B4b1}${B4b2}${B4b3}${B4b4}" |
                    xxd -p -u -r  |
                      iconv -f UTF-8 >/dev/null || { 
                        echo "ERROR: Invalid UTF-8 found: ${B4b1}${B4b2}${B4b3}${B4b4}"; exit 40; }
                  #
              done
          done
      done
  done
  echo "# Test 4 bytes for Valid UTF-8 values: END"
  echo
fi

########################################################################
# There is no test (yet) for negated range values in the astral plane. #  
#                           (all negated range values must be invalid) #
#  I won't bother; This was mainly for me to ge the general feel of    #     
#   the tests, and the final test below should flush anything out..    #
# Traversing the intire UTF-8 range takes quite a while...             #
#   so no need to do it twice (albeit in a slightly different manner)  #
########################################################################

################################
### The construction of:    ####
###  The Regular Expression ####
###      (de-construction?) ####
################################

#     BYTE 1                BYTE 2       BYTE 3      BYTE 4 
# 1: [\x00-\x7F]
#    ===========
#    ([\x00-\x7F])
#
# 2: [\xC2-\xDF]           [\x80-\xBF]
#    =================================
#    ([\xC2-\xDF][\x80-\xBF])
# 
# 3: [\xE0]                [\xA0-\xBF]  [\x80-\xBF]   
#    [\xED]                [\x80-\x9F]  [\x80-\xBF]
#    [\xE1-\xEC\xEE-\xEF]  [\x80-\xBF]  [\x80-\xBF]
#    ==============================================
#    ((([\xE0][\xA0-\xBF])|([\xED][\x80-\x9F])|([\xE1-\xEC\xEE-\xEF][\x80-\xBF]))([\x80-\xBF]))
#
# 4  [\xF0]                [\x90-\xBF]  [\x80-\xBF]  [\x80-\xBF]    
#    [\xF1-\xF3]           [\x80-\xBF]  [\x80-\xBF]  [\x80-\xBF]
#    [\xF4]                [\x80-\x8F]  [\x80-\xBF]  [\x80-\xBF]
#    ===========================================================
#    ((([\xF0][\x90-\xBF])|([\xF1-\xF3][\x80-\xBF])|([\xF4][\x80-\x8F]))([\x80-\xBF]{2}))
#
# The final regex
# ===============
# 1-4:  (([\x00-\x7F])|([\xC2-\xDF][\x80-\xBF])|((([\xE0][\xA0-\xBF])|([\xED][\x80-\x9F])|([\xE1-\xEC\xEE-\xEF][\x80-\xBF]))([\x80-\xBF]))|((([\xF0][\x90-\xBF])|([\xF1-\xF3][\x80-\xBF])|([\xF4][\x80-\x8F]))([\x80-\xBF]{2})))
# 4-1:  (((([\xF0][\x90-\xBF])|([\xF1-\xF3][\x80-\xBF])|([\xF4][\x80-\x8F]))([\x80-\xBF]{2}))|((([\xE0][\xA0-\xBF])|([\xED][\x80-\x9F])|([\xE1-\xEC\xEE-\xEF][\x80-\xBF]))([\x80-\xBF]))|([\xC2-\xDF][\x80-\xBF])|([\x00-\x7F]))


#######################################################################
#  The final Test; for a single character (multi chars to follow)     #  
#   Compare the return code of 'iconv' against the 'regex'            #
#   for the full range of 0x000000 to 0x10FFFF                        #
#                                                                     #     
#  Note; this script has 3 modes:                                     #
#        Run this test TWICE, set each mode Manually!                 #     
#                                                                     #     
#     1. Sequentially test every value from 0x000000 to 0x10FFFF      #     
#     2. Throw a spanner into the works! Force random byte patterns   #     
#     2. Throw a spanner into the works! Force random longer strings  #     
#        ==============================                               #     
#                                                                     #     
#  Note: The purpose of this routine is to determine if there is any  #
#        difference how 'iconv' and 'regex' handle the same data      #  
#                                                                     #     
#######################################################################
if ((Rx==1)) ; then
  # real    191m34.826s
  # user    158m24.114s
  # sys      83m10.676s
  time { 
  invalCt=0
  validCt=0
   failCt=0
  decBeg=$((0x00110000)) # incement by decimal integer
  decMax=$((0x7FFFFFFF)) # incement by decimal integer
  # 
  for ((CPDec=decBeg;CPDec<=decMax;CPDec+=13247)) ;do
      ((D==1)) && echo "=========================================================="
      #
      # Convert decimal integer '$CPDec' to Hex-digits; 6-long  (dec2hex)
      hexUTF32BE=$(printf '%0.8X\n' $CPDec)  # hexUTF32BE

      # progress count  
      if (((CPDec%$((0x1000)))==0)) ;then
          ((Test>2)) && echo
          echo "$hexUTF32BE  Test=$Test mode=${mode[$modebits]}            "
      fi
      if   ((Test==1 || Test==2 ))
      then # Test 1. Sequentially test every value from 0x000000 to 0x10FFFF
          #
          if   ((Test==2)) ; then
              bits=32
              UTF8="$( perl -C -e 'print chr 0x'$hexUTF32BE |
                perl -l -ne '/^(  [\000-\177]
                                | [\300-\337][\200-\277]
                                | [\340-\357][\200-\277]{2}
                                | [\360-\367][\200-\277]{3}
                                | [\370-\373][\200-\277]{4}
                                | [\374-\375][\200-\277]{5}
                               )*$/x and print' |xxd -p )"
              UTF8="${UTF8%0a}"
              [[ -n "$UTF8" ]] \
                    && rcIco32=0 || rcIco32=1
                       rcIco16=

          elif ((modebits==strict && CPDec<=$((0xFFFF)))) ;then
              bits=16
              UTF8="$( echo -n "${hexUTF32BE:4}" |
                xxd -p -u -r |
                  iconv -f UTF-16BE -t UTF-8 2>/dev/null)" \
                    && rcIco16=0 || rcIco16=1  
                       rcIco32=
          else
              bits=32
              UTF8="$( echo -n "$hexUTF32BE" |
                xxd -p -u -r |
                  iconv -f UTF-32BE -t UTF-8 2>/dev/null)" \
                    && rcIco32=0 || rcIco32=1
                       rcIco16=
          fi
          # echo "1 mode=${mode[$modebits]}-$bits  rcIconv: (${rcIco16},${rcIco32})  $hexUTF32BE "
          #
          #
          #
          if ((${rcIco16}${rcIco32}!=0)) ;then
              # 'iconv -f UTF-16BE' failed produce a reliable UTF-8
              if ((bits==16)) ;then
                  ((D==1)) &&           echo "bits-$bits rcIconv: error    $hexUTF32BE .. 'strict' failed, now trying 'lax'"
                  #  iconv failed to create a  'srict' UTF-8 so   
                  #      try UTF-32BE to get a   'lax' UTF-8 pattern    
                  UTF8="$( echo -n "$hexUTF32BE" |
                    xxd -p -u -r |
                      iconv -f UTF-32BE -t UTF-8 2>/dev/null)" \
                        && rcIco32=0 || rcIco32=1
                  #echo "2 mode=${mode[$modebits]}-$bits  rcIconv: (${rcIco16},${rcIco32})  $hexUTF32BE "
                  if ((rcIco32!=0)) ;then
                      ((D==1)) &&               echo -n "bits-$bits rcIconv: Cannot gen UTF-8 for: $hexUTF32BE"
                      rcIco32=1
                  fi
              fi
          fi
          # echo "3 mode=${mode[$modebits]}-$bits  rcIconv: (${rcIco16},${rcIco32})  $hexUTF32BE "
          #
          #
          #
          if ((rcIco16==0 || rcIco32==0)) ;then
              # 'strict(16)' OR 'lax(32)'... 'iconv' managed to generate a UTF-8 pattern  
                  ((D==1)) &&       echo -n "bits-$bits rcIconv: pattern* $hexUTF32BE"
                  ((D==1)) &&       if [[ $bits == "16" && $rcIco32 == "0" ]] ;then 
                  echo " .. 'lax' UTF-8 produced a pattern"
              else
                  echo
              fi
               # regex test
              if ((modebits==strict)) ;then
                 #rxOut="$(echo -n "$UTF8" |perl -l -ne '/^(([\x00-\x7F])|([\xC2-\xDF][\x80-\xBF])|((([\xE0][\xA0-\xBF])|([\xED][\x80-\x9F])|([\xE1-\xEC\xEE-\xEF][\x80-\xBF]))([\x80-\xBF]))|((([\xF0][\x90-\xBF])|([\xF1-\xF3][\x80-\xBF])|([\xF4][\x80-\x8F]))([\x80-\xBF]{2})))*$/ or print' )"
                                     rxOut="$(echo -n "$UTF8" |
                  perl -l -ne '/^( ([\x00-\x7F])             # 1-byte pattern
                                  |([\xC2-\xDF][\x80-\xBF])  # 2-byte pattern
                                  |((([\xE0][\xA0-\xBF])|([\xED][\x80-\x9F])|([\xE1-\xEC\xEE-\xEF][\x80-\xBF]))([\x80-\xBF]))  # 3-byte pattern
                                  |((([\xF0][\x90-\xBF])|([\xF1-\xF3][\x80-\xBF])|([\xF4][\x80-\x8F]))([\x80-\xBF]{2}))        # 4-byte pattern
                                 )*$ /x or print' )"
               else
                  if ((Test==2)) ;then
                      rx="$(echo -n "$UTF8" |perl -l -ne '/^([\000-\177]|[\300-\337][\200-\277]|[\340-\357][\200-\277]{2}|[\360-\367][\200-\277]{3}|[\370-\373][\200-\277]{4}|[\374-\375][\200-\277]{5})*$/ and print')"
                      [[ "$UTF8" != "$rx" ]] && rxOut="$UTF8" || rxOut=
                      rx="$(echo -n "$rx" |sed -e "s/\(..\)/\1 /g")"  
                  else 
                      rxOut="$(echo -n "$UTF8" |perl -l -ne '/^([\000-\177]|[\300-\337][\200-\277]|[\340-\357][\200-\277]{2}|[\360-\367][\200-\277]{3}|[\370-\373][\200-\277]{4}|[\374-\375][\200-\277]{5})*$/ or print' )"
                  fi
              fi
              if [[ "$rxOut" == "" ]] ;then
                ((D==1)) &&           echo "        rcRegex: ok"
                  rcRegex=0
              else
                  ((D==1)) &&           echo -n "bits-$bits rcRegex: error    $hexUTF32BE .. 'strict' failed,"
                  ((D==1)) &&           if [[  "12" == *$Test* ]] ;then 
                                            echo # "  (codepoint) Test $Test" 
                                        else
                                            echo
                                        fi
                  rcRegex=1
              fi
          fi
          #
      elif [[ $Test == 2 ]]
      then # Test 2. Throw a randomizing spanner into the works! 
          #          Then test the  arbitary bytes ASIS
          #
          hexLineRand="$(echo -n "$hexUTF32BE" |
            sed -re "s/(.)(.)(.)(.)(.)(.)(.)(.)/\1\n\2\n\3\n\4\n\5\n\6\n\7\n\8/" |
              sort -R |
                tr -d '\n')"
          # 
      elif [[ $Test == 3 ]]
      then # Test 3. Test single UTF-16BE bytes in the range 0x00000000 to 0x7FFFFFFF
          #
          echo "Test 3 is not properly implemented yet.. Exiting"
          exit 99 
      else
          echo "ERROR: Invalid mode"
          exit
      fi
      #
      #
      if ((Test==1 || Test=2)) ;then
          if ((modebits==strict && CPDec<=$((0xFFFF)))) ;then
              ((rcIconv=rcIco16))
          else
              ((rcIconv=rcIco32))
          fi
          if ((rcRegex!=rcIconv)) ;then
              [[ $Test != 1 ]] && echo
              if ((rcRegex==1)) ;then
                  echo "ERROR: 'regex' ok, but NOT 'iconv': ${hexUTF32BE} "
              else
                  echo "ERROR: 'iconv' ok, but NOT 'regex': ${hexUTF32BE} "
              fi
              ((failCt++));
          elif ((rcRegex!=0)) ;then
            # ((invalCt++)); echo -ne "$hexUTF32BE  exit-codes $${rcIco16}${rcIco32}=,$rcRegex\t: $(printf "%0.8X\n" $invalCt)\t$hexLine$(printf "%$(((mode3whi*2)-${#hexLine}))s")\r"
              ((invalCt++)) 
          else
              ((validCt++)) 
          fi
          if   ((Test==1)) ;then
              echo -ne "$hexUTF32BE "    "mode=${mode[$modebits]}  test-return=($rcIconv,$rcRegex)   valid,invalid,fail=($(printf "%X" $validCt),$(printf "%X" $invalCt),$(printf "%X" $failCt))          \r"
          else 
              echo -ne "$hexUTF32BE $rx mode=${mode[$modebits]} test-return=($rcIconv,$rcRegex)  val,inval,fail=($(printf "%X" $validCt),$(printf "%X" $invalCt),$(printf "%X" $failCt))\r"
          fi
      fi
  done
  } # End time
fi
exit
0
2019-12-03 03:17:39
Source

I assume you possibly desire iconv. It is for transforming in between codesets and also sustains a silly variety of layouts. As an example, to remove anything not legitimate in UTF - 8 you can make use of:

iconv -c -t UTF-8 < input.txt > output.txt

Without the - c alternative it'll report troubles in transforming to stderr, so with procedure instructions can you conserve a checklist of these. An additional means would certainly be to remove the non - UTF8 things and afterwards

diff input.txt output.txt

for a checklist of where adjustments were made.

0
2019-05-21 10:50:49
Source