Regular Expressions 101

^start of line

Non-Capturing Group(?:(?:www\d*|online|subl)*\.)?

?repeats the group contents below at most once:

Non-Capturing Group(?:www\d*|online|subl)*

*repeats the group contents below any number of times:

1st Alternativewww\d*

wwwthe literal text www (case sensitive)

\d*a digit, repeated any number of times

2nd Alternativeonline

onlinethe literal text online (case sensitive)

3rd Alternativesubl

sublthe literal text subl (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:mydomain|alternatedomain)

1st Alternativemydomain

mydomainthe literal text mydomain (case sensitive)

2nd Alternativealternatedomain

alternatedomainthe literal text alternatedomain (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.

Search reference

Regular Expression

^(?:(?:www\d*|online|subl)*\.)?(?:mydomain|alternatedomain)\.com$

New

mydomain.com
www.mydomain.com
www.alternatedomain.com
www100.mydomain.com
online.mydomain.com
subl.mydomain.com