Regular Expressions 101

Pro

Group 1(.*?)

.*?any character (except for line terminators), repeated any number of times

Non-Capturing Group(?:\s+v[0-9]+|\s+vol\.?\s*[0-9]+)

1st Alternative\s+v[0-9]+

\s+any whitespace character, repeated at least once

vthe literal v (118₁₀ / 166₈ / 76₁₆) (case insensitive)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative\s+vol\.?\s*[0-9]+

\s+any whitespace character, repeated at least once

volthe literal text vol (case insensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

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25 tokens

(.*?)(?:\s+v[0-9]+|\s+vol\.?\s*[0-9]+)

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