Regular Expressions 101

Pro

1st Alternative,\s(?:vol|pt)\.(*SKIP)(*F)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\sany whitespace character

Non-Capturing Group(?:vol|pt)

1st Alternativevol

volthe literal text vol (case insensitive)

2nd Alternativept

ptthe literal text pt (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*F)forces the current match attempt to fail at this position

2nd Alternative(?:vol|pt|volume|part)

Non-Capturing Group(?:vol|pt|volume|part)

1st Alternativevol

volthe literal text vol (case insensitive)

2nd Alternativept

ptthe literal text pt (case insensitive)

3rd Alternativevolume

volumethe literal text volume (case insensitive)

4th Alternativepart

partthe literal text part (case insensitive)

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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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25 tokens

(,\s(?:vol|pt)\.(*SKIP)(*F)|(?:vol|pt|volume|part))

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