Regular Expressions 101

^start of line

httpthe literal text http (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

://the literal text ://

Group 1(([^w].+|w(|[^w].*)|ww(|[^w].+)|www.+)\.)?

?repeats the group contents below at most once:

Group 2([^w].+|w(|[^w].*)|ww(|[^w].+)|www.+)

1st Alternative[^w].+

Negated Character Class[^w]

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case sensitive)

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

2nd Alternativew(|[^w].*)

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case sensitive)

Group 3(|[^w].*)

1st Alternative — matches an empty string

2nd Alternative[^w].*

Negated Character Class[^w]

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case sensitive)

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

3rd Alternativeww(|[^w].+)

wwthe literal text ww (case sensitive)

Group 4(|[^w].+)

1st Alternative — matches an empty string

2nd Alternative[^w].+

Negated Character Class[^w]

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case sensitive)

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

4th Alternativewww.+

wwwthe literal text www (case sensitive)

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

examplethe literal text example (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

com -the literal text com - (case sensitive)

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

^https?://(([^w].+|w(|[^w].*)|ww(|[^w].+)|www.+)\.)?example\.com -

New

http://example.com - Match
http://foo.example.com - Match
http://who.example.com - Match
http://w.example.com - Match
http://ww.example.com - Match
http://wwooww.example.com - Match
http://wwwoow.example.com - Match
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http://www.example.com - Does not match