Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python 2.7
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/
((?:href|src)=")(?!http(?:s)?)(?:[^a-z]+)?(.+)
/
g
1st Capturing Group
((?:href|src)=")
Non-capturing group
(?:href|src)
1st Alternative
href
href matches the characters href literally (case sensitive)
2nd Alternative
src
src matches the characters src literally (case sensitive)
=" matches the characters =" literally (case sensitive)
Negative Lookahead
(?!http(?:s)?)
Assert that the Regex below does not match
http matches the characters http literally (case sensitive)
Non-capturing group
(?:s)?
? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy)
s matches the character s literally (case sensitive)
Non-capturing group
(?:[^a-z]+)?
? Quantifier — Matches 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
[^a-z]+
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
a-z a single character in the range between a (index 97) and z (index 122) (case sensitive)
2nd Capturing Group
(.+)
.+
matches any character (except for line terminators)
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String

Substitution

Processing...