Regular Expressions 101

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/
(url\(\s*[*\"\'])(?:[^+\"\']\/)?([^+\/\"\'\)][*\"\']\s*\))
/
ig
1st Capturing Group
(url\(\s*[*\"\'])
url matches the characters url literally (case insensitive)
\( matches the character ( literally (case insensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[\"\']
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\" matches the character " literally (case insensitive)
\' matches the character ' literally (case insensitive)
Non-capturing group
(?:[^+\"\']\/)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
Match a single character not present in the list below
[^\"\']
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\" matches the character " literally (case insensitive)
\' matches the character ' literally (case insensitive)
\/ matches the character / literally (case insensitive)
2nd Capturing Group
([^+\/\"\'\)][*\"\']\s*\))
Match a single character not present in the list below
[^\/\"\'\)]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\/ matches the character / literally (case insensitive)
\" matches the character " literally (case insensitive)
\' matches the character ' literally (case insensitive)
\) matches the character ) literally (case insensitive)
Match a single character present in the list below
[\"\']
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\" matches the character " literally (case insensitive)
\' matches the character ' literally (case insensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\) matches the character ) literally (case insensitive)
Global pattern flags
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
ig

Test String

Substitution

Processing...