How do I remove carriage returns with Ruby

Question

I thought this code would work  but the regular expression doesn t ever match the  r n  I have viewed the data I am reading in a hex editor and verified there really is a hex D and hex A pattern in the file   I have also tried the regular expressions   xD xA m and   x0D x0A m but they also didn t match   This is my code right now      lines2   lines gsub    r n m    n       if   lines    lines2          print  still the same n     else        print  made the change n     end   In addition to alternatives  it would be nice to know what I m doing wrong  to facilitate some learning on my part

User · Answer

You can use this    my string strip gsub   s

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Use String strip     Returns a copy of str with leading and trailing whitespace removed    e g       hello      strip      gt   hello       tgoodbye r n  strip      gt   goodbye      Using gsub  string   string gsub   r       string   string gsub   n

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What do you get when you do puts lines  That will give you a clue   By default File open opens the file in text mode  so your  r n characters will be automatically converted to  n  Maybe that s the reason lines are always equal to lines2  To prevent Ruby from parsing the line ends use the rb mode   C    copy con lala txt a file with many lines  Z  C    irb irb main  001 0  text   File open  lala txt   read     a nfile nwith nmany nlines n  irb main  002 0  bin   File open  lala txt    rb   read     a r nfile r nwith r nmany r nlines r n  irb main  003 0    But from your question and code I see you simply need to open the file with the default modifier  You don t need any conversion and may use the shorter File read

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lines2   lines split join   n

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If you are using Rails  there is a squish method    tgoodbye r n  squish   gt   goodbye     tgood     t r nbye r n  squish   gt   good bye

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Generally when I deal with stripping  r or  n  I ll look for both by doing something like  lines gsub   r n      n      I ve found that depending on how the data was saved  the OS used  editor used  Jupiter s relation to Io at the time  there may or may not be the newline after the carriage return  It does seem weird that you see both characters in hex mode  Hope this helps

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How about the following   irb main  003 0 gt  my string    Some text with a carriage return  r    gt   Some text with a carriage return  r  irb main  004 0 gt  my string gsub   r        gt   Some text with a carriage return   irb main  005 0 gt    Or     irb main  007 0 gt  my string    Some text with a carriage return  r n    gt   Some text with a carriage return  r n  irb main  008 0 gt  my string gsub   r n    n     gt   Some text with a carriage return  n  irb main  009 0 gt

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def dos2unix input    input each byte map    c  c chr unless c    13   join end  remove all the carriage returns   dos2unix some blob

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still the same n  chomp or  still the same n  chomp   http   www ruby-doc org core-1 9 3 String html method-i-chomp

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lines map  amp  strip  join

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lines2   lines split join   n

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Why not read the file in text mode  rather than binary mode

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What do you get when you do puts lines  That will give you a clue   By default File open opens the file in text mode  so your  r n characters will be automatically converted to  n  Maybe that s the reason lines are always equal to lines2  To prevent Ruby from parsing the line ends use the rb mode   C    copy con lala txt a file with many lines  Z  C    irb irb main  001 0  text   File open  lala txt   read     a nfile nwith nmany nlines n  irb main  002 0  bin   File open  lala txt    rb   read     a r nfile r nwith r nmany r nlines r n  irb main  003 0    But from your question and code I see you simply need to open the file with the default modifier  You don t need any conversion and may use the shorter File read

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modified string   string gsub   s         strip

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lines2   lines split join   n

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Just another variant   lines delete    n

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You can use this    my string strip gsub   s

User · Answer

Generally when I deal with stripping  r or  n  I ll look for both by doing something like  lines gsub   r n      n      I ve found that depending on how the data was saved  the OS used  editor used  Jupiter s relation to Io at the time  there may or may not be the newline after the carriage return  It does seem weird that you see both characters in hex mode  Hope this helps

User · Answer

What do you get when you do puts lines  That will give you a clue   By default File open opens the file in text mode  so your  r n characters will be automatically converted to  n  Maybe that s the reason lines are always equal to lines2  To prevent Ruby from parsing the line ends use the rb mode   C    copy con lala txt a file with many lines  Z  C    irb irb main  001 0  text   File open  lala txt   read     a nfile nwith nmany nlines n  irb main  002 0  bin   File open  lala txt    rb   read     a r nfile r nwith r nmany r nlines r n  irb main  003 0    But from your question and code I see you simply need to open the file with the default modifier  You don t need any conversion and may use the shorter File read

User · Answer

Just another variant   lines delete    n

User · Answer

Use String strip     Returns a copy of str with leading and trailing whitespace removed    e g       hello      strip      gt   hello       tgoodbye r n  strip      gt   goodbye      Using gsub  string   string gsub   r       string   string gsub   n

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modified string   string gsub   s         strip

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still the same n  chomp or  still the same n  chomp   http   www ruby-doc org core-1 9 3 String html method-i-chomp

User · Answer

What do you get when you do puts lines  That will give you a clue   By default File open opens the file in text mode  so your  r n characters will be automatically converted to  n  Maybe that s the reason lines are always equal to lines2  To prevent Ruby from parsing the line ends use the rb mode   C    copy con lala txt a file with many lines  Z  C    irb irb main  001 0  text   File open  lala txt   read     a nfile nwith nmany nlines n  irb main  002 0  bin   File open  lala txt    rb   read     a r nfile r nwith r nmany r nlines r n  irb main  003 0    But from your question and code I see you simply need to open the file with the default modifier  You don t need any conversion and may use the shorter File read

User · Answer

lines2   lines split join   n

User · Answer

def dos2unix input    input each byte map    c  c chr unless c    13   join end  remove all the carriage returns   dos2unix some blob

User · Answer

How about the following   irb main  003 0 gt  my string    Some text with a carriage return  r    gt   Some text with a carriage return  r  irb main  004 0 gt  my string gsub   r        gt   Some text with a carriage return   irb main  005 0 gt    Or     irb main  007 0 gt  my string    Some text with a carriage return  r n    gt   Some text with a carriage return  r n  irb main  008 0 gt  my string gsub   r n    n     gt   Some text with a carriage return  n  irb main  009 0 gt

User · Answer

Generally when I deal with stripping  r or  n  I ll look for both by doing something like  lines gsub   r n      n      I ve found that depending on how the data was saved  the OS used  editor used  Jupiter s relation to Io at the time  there may or may not be the newline after the carriage return  It does seem weird that you see both characters in hex mode  Hope this helps

User · Answer

How about the following   irb main  003 0 gt  my string    Some text with a carriage return  r    gt   Some text with a carriage return  r  irb main  004 0 gt  my string gsub   r        gt   Some text with a carriage return   irb main  005 0 gt    Or     irb main  007 0 gt  my string    Some text with a carriage return  r n    gt   Some text with a carriage return  r n  irb main  008 0 gt  my string gsub   r n    n     gt   Some text with a carriage return  n  irb main  009 0 gt

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How about the following   irb main  003 0 gt  my string    Some text with a carriage return  r    gt   Some text with a carriage return  r  irb main  004 0 gt  my string gsub   r        gt   Some text with a carriage return   irb main  005 0 gt    Or     irb main  007 0 gt  my string    Some text with a carriage return  r n    gt   Some text with a carriage return  r n  irb main  008 0 gt  my string gsub   r n    n     gt   Some text with a carriage return  n  irb main  009 0 gt

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I think your regex is almost complete - here s what I would do   lines2   lines gsub    r n   m    n     In the above  I ve put  r and  n into a class  that way it doesn t matter in which order they might appear  and added the     qualifier  so that   r n r n r n  would also match once  and the whole thing replaced with   n

User · Answer

Why not read the file in text mode  rather than binary mode

User · Answer

If you are using Rails  there is a squish method    tgoodbye r n  squish   gt   goodbye     tgood     t r nbye r n  squish   gt   good bye

User · Answer

Generally when I deal with stripping  r or  n  I ll look for both by doing something like  lines gsub   r n      n      I ve found that depending on how the data was saved  the OS used  editor used  Jupiter s relation to Io at the time  there may or may not be the newline after the carriage return  It does seem weird that you see both characters in hex mode  Hope this helps

User · Answer

I think your regex is almost complete - here s what I would do   lines2   lines gsub    r n   m    n     In the above  I ve put  r and  n into a class  that way it doesn t matter in which order they might appear  and added the     qualifier  so that   r n r n r n  would also match once  and the whole thing replaced with   n

User · Answer

lines map  amp  strip  join

[ruby] How do I remove carriage returns with Ruby?

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