Regular Expressions 101

^start of string

Group 1([^=]+)

Negated Character Class[^=]+

+matches at least one character outside the set below:

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 2(\d+)

\d+a digit, repeated at least once

\na line-feed (newline) character (ASCII 10)

Group 3(.*?)

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

\1the text saved by group 1

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\d+a digit, repeated at least once

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^([^=]+)=(\d+)\n(.*?)\1=\d+

New

test2=5
test=39&test2=4&test3=10

$3$1=$2