Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!.*(RedGemEtc))

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

Group 1(RedGemEtc)

RedGemEtcthe literal text RedGemEtc (case sensitive)

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

Condition(?(1)xyzzy|<.>)

Uses the first branch if group 1 matched

If the condition is true, match this branch:xyzzy

xyzzythe literal text xyzzy (case sensitive)

Otherwise, match this branch:<.>

<the literal < (60₁₀ / 74₈ / 3C₁₆)

.any character (except for line terminators)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

^(?!.*(RedGemEtc)).*(?(1)xyzzy|<.>)

New

a baz blahblah foobar <紅> a
b baz RedGemEtc foobar <黑> b
c baz blahblah foobar <不> c
d baz RedGemEtc foobar [巴] d