Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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~
<c>.</c>
~
gui
<c> matches the characters <c> literally (case insensitive)
.
matches any character, including unicode (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
</c> matches the characters </c> literally (case insensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
u modifier: unicode. Pattern strings are treated as UTF-16. Also causes escape sequences to match unicode characters
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

~
~
gui

Test String

Substitution

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