Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python 2.7
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<\?xml(.)\?>
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< matches the character < literally (case sensitive)
\? matches the character ? literally (case sensitive)
xml matches the characters xml literally (case sensitive)
1st Capturing Group
(.)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
\? matches the character ? literally (case sensitive)
> matches the character > literally (case sensitive)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

%
%

Test String