Regular Expressions 101

Group 1(src\s*=\s*|background\s*=\s*|url\()

1st Alternativesrc\s*=\s*

srcthe literal text src (case insensitive)

\s*a Unicode whitespace character, repeated any number of times

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\s*a Unicode whitespace character, repeated any number of times

2nd Alternativebackground\s*=\s*

backgroundthe literal text background (case insensitive)

\s*a Unicode whitespace character, repeated any number of times

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\s*a Unicode whitespace character, repeated any number of times

3rd Alternativeurl\(

urlthe literal text url (case insensitive)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 2(["\'])

Character Class["\']

"the literal " (34₁₀ / 42₈ / 22₁₆)

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negative Lookahead(?![a-z]+:|[\/\\#])

1st Alternative[a-z]+:

Character Class[a-z]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

2nd Alternative[\/\\#]

Character Class[\/\\#]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

Group 3(.+?)

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

\2the text saved by group 2

Global pattern flags

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

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

u modifier: unicode. Treats the pattern and subject as UTF-16

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(src\s*=\s*|background\s*=\s*|url\()(["\'])(?![a-z]+:|[\/\\#])(.+?)\2

New

url(asdfsdf.png)
url('asdfsdf.png')
url("asdfsdf.png")
src="asdfsdf.png"
src='asdfsdf.png'
background='asdfsdf.png'
background="asdfsdf.png"
url('http://cz.google.com/asdfsdf.png')
src=asdfsdf.png