Regular Expressions 101

Negative Lookbehind(?<!\d)

\da digit

Group 1(\d{1,2}|100)

1st Alternative\d{1,2}

\d{1,2}a digit, repeated between 1 and 2 times

2nd Alternative100

100the literal text 100

Negative Lookahead(?!\d)

\da digit

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

(?<!\d)(\d{1,2}|100)(?!\d)

6 4 88 100 345 34534 2334 100 435 45 33 345345 100 4334 100