Regular Expressions 101

urlthe literal text url (case sensitive)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 1("|\')

1st Alternative"

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative\'

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group 2((?!http://|https://).*?)

Negative Lookahead(?!http://|https://)

1st Alternativehttp://

http://the literal text http:// (case sensitive)

2nd Alternativehttps://

https://the literal text https:// (case sensitive)

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

Non-Capturing Group(?:\1)

\1the text saved by group 1

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

url\(("|\')((?!http://|https://).*?)(?:\1)\)

New

url("file.gif")
("http://google.com/image.png")
url('https://example.com/file.jpg')
url('dir/dir/image.tiff')