Case insensitive regular expression without re compile

Question

In Python  I can compile a regular expression to be case-insensitive using re compile    gt  gt  gt  s    TeSt   gt  gt  gt  casesensitive   re compile  test    gt  gt  gt  ignorecase   re compile  test   re IGNORECASE   gt  gt  gt    gt  gt  gt  print casesensitive match s  None  gt  gt  gt  print ignorecase match s   lt  sre SRE Match object at 0x02F0B608 gt    Is there a way to do the same  but without using re compile  I can t find anything like Perl s i suffix  e g  m test i  in the documentation

User · Answer

In imports  import re   In run time processing   RE TEST   r test  if re match RE TEST   TeSt   re IGNORECASE     It should be mentioned that not using re compile is wasteful  Every time the above match method is called  the regular expression will be compiled  This is also faulty practice in other programming languages  The below is the better practice   In app initialization   self RE TEST   re compile  test   re IGNORECASE    In run time processing   if self RE TEST match  TeSt

User · Answer

re IGNORECASE  for case insensitive results short form re I   re match  returns the first match located from the start of the string     re search  returns location of the where the match is found    re compile  creates a regex object that can be used for multiple matches    gt  gt  gt  s   r TeSt       gt  gt  gt  print  re match s  r test123   re I     lt  sre SRE Match object  span  0  4   match  test  gt     OR   gt  gt  gt  pattern   re compile s  re I    gt  gt  gt  print pattern match r test123      lt  sre SRE Match object  span  0  4   match  test  gt

User · Answer

The case-insensitive marker    i  can be incorporated directly into the regex pattern    gt  gt  gt  import re  gt  gt  gt  s    This is one Test  another TEST  and another test    gt  gt  gt  re findall    i test   s    Test    TEST    test

User · Answer

Pass re IGNORECASE to the flags param of search  match  or sub   re search  test    TeSt   re IGNORECASE  re match  test    TeSt   re IGNORECASE  re sub  test    xxxx    Testing   flags re IGNORECASE

User · Answer

For Case insensitive regular expression Regex   There are two ways by adding in your code    flags re IGNORECASE  Regx3GList   re search   WCDMA     d           txt    re IGNORECASE     The case-insensitive marker   i   Regx3GList   re search      i    WCDMA     d           txt

User · Answer

To perform case-insensitive operations  supply re IGNORECASE   gt  gt  gt  import re  gt  gt  gt  test    UPPER TEXT  lower text  Mixed Text   gt  gt  gt  re findall  text   test  flags re IGNORECASE    TEXT    text    Text     and if we want to replace text matching the case      gt  gt  gt  def matchcase word           def replace m               text   m group               if text isupper                    return word upper               elif text islower                    return word lower               elif text 0  isupper                    return word capitalize               else                  return word         return replace   gt  gt  gt  re sub  text   matchcase  word    test  flags re IGNORECASE   UPPER WORD  lower word  Mixed Word

User · Answer

To perform case-insensitive operations  supply re IGNORECASE   gt  gt  gt  import re  gt  gt  gt  test    UPPER TEXT  lower text  Mixed Text   gt  gt  gt  re findall  text   test  flags re IGNORECASE    TEXT    text    Text     and if we want to replace text matching the case      gt  gt  gt  def matchcase word           def replace m               text   m group               if text isupper                    return word upper               elif text islower                    return word lower               elif text 0  isupper                    return word capitalize               else                  return word         return replace   gt  gt  gt  re sub  text   matchcase  word    test  flags re IGNORECASE   UPPER WORD  lower word  Mixed Word

User · Answer

In imports  import re   In run time processing   RE TEST   r test  if re match RE TEST   TeSt   re IGNORECASE     It should be mentioned that not using re compile is wasteful  Every time the above match method is called  the regular expression will be compiled  This is also faulty practice in other programming languages  The below is the better practice   In app initialization   self RE TEST   re compile  test   re IGNORECASE    In run time processing   if self RE TEST match  TeSt

User · Answer

If you would like to replace but still keeping the style of previous str  It is possible   For example  highlight the string  test asdasd TEST asd tEst asdasd    sentence    test asdasd TEST asd tEst asdasd  result   re sub      test       r  lt b gt  1 lt  b gt        1 here indicates first matching group    sentence     flags re IGNORECASE    test asdasd TEST asd tEst asdasd

User · Answer

You can also perform case insensitive searches using search match without the IGNORECASE flag  tested in Python 2 7 3    re search r   i test    TeSt   group         returns  TeSt  re match r   i test    TeSt   group          returns  TeSt

User · Answer

You can also define case insensitive during the pattern compile   pattern   re compile  FIle          re IGNORECASE

User · Answer

Pass re IGNORECASE to the flags param of search  match  or sub   re search  test    TeSt   re IGNORECASE  re match  test    TeSt   re IGNORECASE  re sub  test    xxxx    Testing   flags re IGNORECASE

User · Answer

You can also define case insensitive during the pattern compile   pattern   re compile  FIle          re IGNORECASE

User · Answer

Pass re IGNORECASE to the flags param of search  match  or sub   re search  test    TeSt   re IGNORECASE  re match  test    TeSt   re IGNORECASE  re sub  test    xxxx    Testing   flags re IGNORECASE

User · Answer

The case-insensitive marker    i  can be incorporated directly into the regex pattern    gt  gt  gt  import re  gt  gt  gt  s    This is one Test  another TEST  and another test    gt  gt  gt  re findall    i test   s    Test    TEST    test

User · Answer

re IGNORECASE  for case insensitive results short form re I   re match  returns the first match located from the start of the string     re search  returns location of the where the match is found    re compile  creates a regex object that can be used for multiple matches    gt  gt  gt  s   r TeSt       gt  gt  gt  print  re match s  r test123   re I     lt  sre SRE Match object  span  0  4   match  test  gt     OR   gt  gt  gt  pattern   re compile s  re I    gt  gt  gt  print pattern match r test123      lt  sre SRE Match object  span  0  4   match  test  gt

User · Answer

For Case insensitive regular expression Regex   There are two ways by adding in your code    flags re IGNORECASE  Regx3GList   re search   WCDMA     d           txt    re IGNORECASE     The case-insensitive marker   i   Regx3GList   re search      i    WCDMA     d           txt

User · Answer

You can also perform case insensitive searches using search match without the IGNORECASE flag  tested in Python 2 7 3    re search r   i test    TeSt   group         returns  TeSt  re match r   i test    TeSt   group          returns  TeSt

User · Answer

If you would like to replace but still keeping the style of previous str  It is possible   For example  highlight the string  test asdasd TEST asd tEst asdasd    sentence    test asdasd TEST asd tEst asdasd  result   re sub      test       r  lt b gt  1 lt  b gt        1 here indicates first matching group    sentence     flags re IGNORECASE    test asdasd TEST asd tEst asdasd

User · Answer

Pass re IGNORECASE to the flags param of search  match  or sub   re search  test    TeSt   re IGNORECASE  re match  test    TeSt   re IGNORECASE  re sub  test    xxxx    Testing   flags re IGNORECASE

[python] Case insensitive regular expression without re.compile?

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