Regular Expressions 101

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

Positive Lookahead(?=[A-Z0-9_]{4}\d{4}$)

Character Class[A-Z0-9_]{4}

{4}matches exactly 4 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d{4}a digit, repeated exactly 4 times

$end of line

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

.*(?=[A-Z0-9_]{4}\d{4}$)

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