Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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/
(((?!\<img).)*)(\<img.[^>]*\>)(((?!\<img).)*)
/
sg
1st Capturing Group
(((?!\<img).)*)
2nd Capturing Group
((?!\<img).)*
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Negative Lookahead
(?!\<img)
Assert that the Regex below does not match
\< matches the character < literally (case sensitive)
img matches the characters img literally (case sensitive)
. matches any character
3rd Capturing Group
(\<img.[^>]*\>)
\< matches the character < literally (case sensitive)
img matches the characters img literally (case sensitive)
. matches any character
Match a single character not present in the list below
[^>]*
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
> matches the character > literally (case sensitive)
\> matches the character > literally (case sensitive)
4th Capturing Group
(((?!\<img).)*)
5th Capturing Group
((?!\<img).)*
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Negative Lookahead
(?!\<img)
Assert that the Regex below does not match
\< matches the character < literally (case sensitive)
img matches the characters img literally (case sensitive)
. matches any character
Global pattern flags
s modifier: single line. Dot matches newline characters
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

/
/
sg

Test String