Regular Expressions 101

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/
(?ms)\<test\s(?P<tmp>.*?)\<\/test\>
/
gm
(?ms)
match the remainder of the pattern with the following effective flags: gms
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
s modifier: single line. Dot matches newline characters
\< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
test
matches the characters test literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Named Capture Group tmp
(?P<tmp>.*?)
.
matches any character
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
test
matches the characters test literally (case sensitive)
\> matches the character > with index 6210 (3E16 or 768) 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

Code Generator

Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php