Regular Expressions 101

Pro

Positive Lookbehind(?<=[^\W_])

Negated Character Class[^\W_]

\Wany character that is not a Unicode word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Non-Capturing Group(?:(?!\n)[\W_])+

+repeats the group contents below at least once:

Negative Lookahead(?!\n)

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

Character Class[\W_]

\Wany character that is not a Unicode word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Positive Lookahead(?=[^\W_])

Negated Character Class[^\W_]

\Wany character that is not a Unicode word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

Ready to run

25 tokens

(?<=[^\W_])(?:(?!\n)[\W_])+(?=[^\W_])