Regular Expressions 101

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

start the literal text start (case insensitive)

Group 1([^_\r\n\t\f\v\s]*)

Negated Character Class[^_\r\n\t\f\v\s]*

*matches any number of characters outside the set below:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

\ta tab character (ASCII 9)

\fa form-feed character (ASCII 12)

\vany vertical whitespace character

\sany whitespace character

Non-Capturing Group(?:_(\S+))?

?repeats the group contents below at most once:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 2(\S+)

\S+any non-whitespace character, repeated at least once

Global pattern flags

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

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Search reference

Regular Expression

\/start ([^_\r\n\t\f\v\s]*)(?:_(\S+))?

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