Regular Expressions 101

^start of line

Group 1(.+)

.+any character (except for line terminators), repeated at least once

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2(.+)

.+any character (except for line terminators), repeated at least once

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negative Lookahead(?!\1)

\1the text saved by group 1

Negative Lookahead(?!\2)

\2the text saved by group 2

.+any character (except for line terminators), 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.

Search reference

Regular Expression

^(.+)-(.+)=(?!\1)(?!\2).+$

New

abc-b=ac
abcde-cd=abe
ab-a=b
abcde-a=bcde
abcde-cde=ab

abc-a=c
abcde-bd=ace
abc-cd=ab
abcde-a=cde
abc-abc=
abc-=abc