Regular Expressions 101

Pro

^start of line

Group 1(subdomain1\.|subdomain2\.)?

?repeats the group contents below at most once:

1st Alternativesubdomain1\.

subdomain1the literal text subdomain1 (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternativesubdomain2\.

subdomain2the literal text subdomain2 (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(((?<branch>(?!subdomain1|subdomain2).+)\.|)staging\.com)

Group 3((?<branch>(?!subdomain1|subdomain2).+)\.|)

1st Alternative(?<branch>(?!subdomain1|subdomain2).+)\.

Group branch(?<branch>(?!subdomain1|subdomain2).+)

Negative Lookahead(?!subdomain1|subdomain2)

1st Alternativesubdomain1

subdomain1the literal text subdomain1 (case sensitive)

2nd Alternativesubdomain2

subdomain2the literal text subdomain2 (case sensitive)

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative — matches an empty string

stagingthe literal text staging (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

$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

^(subdomain1\.|subdomain2\.)?(((?<branch>(?!subdomain1|subdomain2).+)\.|)staging\.com)$

New

subdomain1.branch-name.staging.com
subdomain1.branch-name-with-subdomain1.staging.com
subdomain2.subdomain1.staging.com