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RegEx capturing group in Elixir


RegEx capturing group in Elixir

By : Harsha Kantha
Date : October 18 2020, 06:10 PM
Does that help
I'm not able to understand why the last % is repeated after matching the regex.
code :
([^\w]+)
([^\w])([^\w])...([^\w])
1> Regex.run(~r{(*UTF)([^\w]+)}, "dd!!%%%")              
["!!%%%", "!!%%%"]
iex(9)> Regex.run(~r{(*UTF)([^\w])([^\w])([^\w])}, "dd!!%%%")
["!!%", "!", "!", "%"]
([^\w])


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regex ignore capturing group inside capturing group

regex ignore capturing group inside capturing group


By : Surendra Vimal
Date : March 29 2020, 07:55 AM
I wish this helpful for you If I understand you correctly: if the d is there, then the capture-group should be eee, but if the d is not there, then the capture-group should be blank or null. Is that correct? If so, you can write:
code :
/^(?:\s*)([abc])?(?:\s*)(?:d([ef]*)|[ef]*)(.*)/.exec(' a deee ghi')
Perl Regex Group capturing -- not capturing all the text in the group

Perl Regex Group capturing -- not capturing all the text in the group


By : Muthu gowrishankar
Date : March 29 2020, 07:55 AM
To fix this issue Parentheses confusion. You were passing only one argument to the function, and printing 2 things. The second was a literal 915. Pass both parameters to the function, and print only one thing:
code :
print get_marc_datafield("<datafield tag=\"915\">RandomStuff</datafield>", "915");
Perl RegEx non-capturing group with alternative capturing within the group

Perl RegEx non-capturing group with alternative capturing within the group


By : user3328401
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I'm trying to parse out some mail logs that have the three following possible formats for the relay. , You have two alternatives in the relay field:
code :
relay=(?:(?:\S+ )?\[(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\]|(\S+)\.)
                    ^    ----      $6         ----     ^  | ^$7^ 
(?|(?:\S+ )?\[(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\]|(\S+)\.)
  ^
    my ($month, $day, $time, $id, $addy, $relay, $relay_alt, $stat) = $line =~ m/$topat/;
    $relay //= $relay_alt;
Grep non capturing group and capturing group in the same regex. Print only the capturing group

Grep non capturing group and capturing group in the same regex. Print only the capturing group


By : user3435002
Date : March 29 2020, 07:55 AM
will help you You cannot use -E (ERE) and -P (perl mode) options together in gnu grep. If you are using gnu grep then just stick with -P and use this command to get all version numbers:
code :
grep -ioP "version\D*\K(\d+\.[\d,A-Z,a-z]+\.[\d,a-z,A-Z]+)" file
1.1.1
1.1.1
1.1.1
1.1.1
Python regex matching with only second capturing group - not using the first capturing group

Python regex matching with only second capturing group - not using the first capturing group


By : user3581189
Date : March 29 2020, 07:55 AM
it helps some times I removed some brackets in the pattern and it worked for me. Every part is optional besides consignee.
code :
con = r"(consignee\s?(name)?\s?(and)?\s?(address)?|(name)?\s?(and)?\s?(address)?\s?(of)\s?consignee)"
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