Regular Expressions 101

Non-Capturing Group(?:^\s*|\G)

1st Alternative^\s*

^start of line

\s*any whitespace character, repeated any number of times

2nd Alternative\G

\Gstart of current search

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:,\s*)?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\s*any whitespace character, repeated any number of times

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

Group 1(\b\d{1,2}\b)

\ban ASCII word boundary

\d{1,2}a digit, repeated between 1 and 2 times

\ban ASCII word boundary

Positive Lookahead(?=(?:\s*(?:,\s*)?\b\d{1,2}\b)*$)

Non-Capturing Group(?:\s*(?:,\s*)?\b\d{1,2}\b)*

*repeats the group contents below any number of times:

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:,\s*)?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\s*any whitespace character, repeated any number of times

\ban ASCII word boundary

\d{1,2}a digit, repeated between 1 and 2 times

\ban ASCII word boundary

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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Search reference

Regular Expression

(?:^\s*|\G)\s*(?:,\s*)?\K(\b\d{1,2}\b)(?=(?:\s*(?:,\s*)?\b\d{1,2}\b)*$)

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