Regular Expressions 101

Pro

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

(?i)applies the following effective flags to the remainder of the pattern: gmi

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Negative Lookbehind(?<!subdomain1\.|subdomain2\.)

1st Alternativesubdomain1\.

subdomain1the literal text subdomain1 (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternativesubdomain2\.

subdomain2the literal text subdomain2 (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

examplethe literal text example (case insensitive)

.any character (except for line terminators)

orgthe literal text org (case insensitive)

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

.*(?i)(?<!subdomain1\.|subdomain2\.)example.org

subdomain1.example.org
SUBDOMAIN1.example.org
subdomain2.example.org
SUBDOMAIN2.example.org
SuBdOMain2.eXAMPLE.org
blub.example.org
example.org
othersubdomain.example.org

Substitution

subdomain1.example.org
SUBDOMAIN1.example.org
subdomain2.example.org
SUBDOMAIN2.example.org
SuBdOMain2.eXAMPLE.org
blub.example.org
example.org
othersubdomain.example.org