Regular Expressions 101

Pro

1st Alternative^\d+(?=\d{2})

^start of line

\d+a digit, repeated at least once

Positive Lookahead(?=\d{2})

\d{2}a digit, repeated exactly 2 times

2nd Alternative(\d{2})\d+$

Group 1(\d{2})

\d{2}a digit, repeated exactly 2 times

\d+a digit, repeated at least once

$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.

25 tokens

Regular Expression

^\d+(?=\d{2})|(\d{2})\d+$

New

353451word2423157
anotherword
7412yetanother1
3262andherese123anotherline4359013
5342512354325324523andherese123anotherline45913
532453andherese123anotherline413

Substitution

$1

353451word2423157
anotherword
7412yetanother1
3262andherese123anotherline4359013
5342512354325324523andherese123anotherline45913
532453andherese123anotherline413