Regular Expressions 101

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/
<(?<key>[^>]+)>(?<value>[^<]+)<\/\1>
/
sg
< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
Named Capture Group key
(?<key>[^>]+)
Match a single character not present in the list below
[^>]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
> matches the character > with index 6210 (3E16 or 768) literally (case sensitive)
> matches the character > with index 6210 (3E16 or 768) literally (case sensitive)
Named Capture Group value
(?<value>[^<]+)
Match a single character not present in the list below
[^<]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\1 matches the same text as most recently matched by the 1st capturing group
> matches the character > with index 6210 (3E16 or 768) literally (case sensitive)
Global pattern flags
s modifier: single line. Dot matches newline characters
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
sg

Test String