Regular Expressions 101

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/
<iframe[^>]*src=[\"|']([^'\"]+)[\"|'][^>]*>
/
i
<iframe
matches the characters <iframe literally (case insensitive)
Match a single character not 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 > with index 6210 (3E16 or 768) literally (case insensitive)
src=
matches the characters src= literally (case insensitive)
Match a single character present in the list below
[\"|']
\" matches the character " with index 3410 (2216 or 428) literally (case insensitive)
|'
matches a single character in the list |' (case insensitive)
1st Capturing Group
([^'\"]+)
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 ' with index 3910 (2716 or 478) literally (case insensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case insensitive)
Match a single character present in the list below
[\"|']
\" matches the character " with index 3410 (2216 or 428) literally (case insensitive)
|'
matches a single character in the list |' (case insensitive)
Match a single character not 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 > with index 6210 (3E16 or 768) literally (case insensitive)
> matches the character > with index 6210 (3E16 or 768) literally (case insensitive)
Global pattern flags
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
i

Test String