Regular Expressions 101

^start of line

Non-Capturing Group(?:(?! PAGE)[A-Z0-9\s])+

+repeats the group contents below at least once:

Negative Lookahead(?! PAGE)

PAGEthe literal text PAGE (case sensitive)

Character Class[A-Z0-9\s]

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

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

\sany whitespace character

Character Class[A-Z]

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

Non-Capturing Group(?: \d{4})?

?repeats the group contents below at most once:

the literal (32₁₀ / 40₈ / 20₁₆)

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

\ban ASCII word boundary

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

^(?:(?! PAGE)[A-Z0-9\s])+[A-Z](?: \d{4})?\b

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FREE SOFT FOUNDATION V2 1989 PAGE 2
STALLMANWORKS 2000 1977;PAGE 2
THE GNU PAGE 3 1977