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[a-zA-Z]+\s*[a-zA-Z]+\s*\(\s*+long+\s*(,+\s*+[a-zA-Z]+\s*)*\)

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gm

Match a single character present in the list below

[a-zA-Z]

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)

A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

Match a single character present in the list below

[a-zA-Z]

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)

A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

\( matches the character ( with index 40_{10} (28_{16} or 50_{8}) literally (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])*+ matches the previous token between zero and unlimited times, as many times as possible, without giving back (possessive)

lon

matches the characters lon literally (case sensitive)g

matches the character g with index 103\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

1st Capturing Group

(,+\s*+[a-zA-Z]+\s*)*

* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data

,

matches the character , with index 44\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])*+ matches the previous token between zero and unlimited times, as many times as possible, without giving back (possessive)

Match a single character present in the list below

[a-zA-Z]

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)

A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])\) matches the character ) with index 41_{10} (29_{16} or 51_{8}) literally (case sensitive)

Global pattern flags

g modifier: **g**lobal. All matches (don't return after first match)

m modifier: **m**ulti line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

Your regular expression does not match the subject string.Try launching the debugger to find out why.

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gm

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