Regular Expressions 101

Pro

1st Alternative(?<!\d)\d{8}_\d{6}(?!\d)(*SKIP)(*F)

Negative Lookbehind(?<!\d)

\da digit

\d{8}a digit, repeated exactly 8 times

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d{6}a digit, repeated exactly 6 times

Negative Lookahead(?!\d)

\da digit

(*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_

_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

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25 tokens

(?<!\d)\d{8}_\d{6}(?!\d)(*SKIP)(*F)|_

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