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~

(\S+)\s+(\d+)(?:;\s+)?

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gm

1st Capturing Group

(\S+)

\S

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

\s

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

2nd Capturing Group

(\d+)

\d

matches a digit (equivalent to [0-9])+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

Non-capturing group

(?:;\s+)?

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

; matches the character ; with index 59_{10} (3B_{16} or 73_{8}) literally (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])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.

~

~

gm

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