Regular Expressions 101

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/
(\<\?[^php|\=|xml])
/
gm
1st Capturing Group
(\<\?[^php|\=|xml])
\< matches the character < literally (case sensitive)
\? matches the character ? literally (case sensitive)
Match a single character not present in the list below
[^php|\=|xml]
php| matches a single character in the list ph| (case sensitive)
\= matches the character = literally (case sensitive)
|xml matches a single character in the list |xml (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String