Regular Expressions 101

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/
\?>[\r\n\t ]+
/
gm
\? matches the character ? with index 6310 (3F16 or 778) literally (case sensitive)
> matches the character > with index 6210 (3E16 or 768) literally (case sensitive)
Match a single character present in the list below
[\r\n\t ]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\r matches a carriage return (ASCII 13)
\n matches a line-feed (newline) character (ASCII 10)
\t matches a tab character (ASCII 9)
matches the character with index 3210 (2016 or 408) literally (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