Regular Expressions 101

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/
<textarea\b[^>]*>((\n*|.)*)<\/textarea>
/
g
<textarea
matches the characters <textarea literally (case sensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
Match a single character not present in the list below
[^>]
* matches the previous token between zero 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)
1st Capturing Group
((\n*|.)*)
2nd Capturing Group
(\n*|.)*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
1st Alternative
\n*
\n
matches a line-feed (newline) character (ASCII 10)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Alternative
.
. matches any character (except for line terminators)
< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
textarea>
matches the characters textarea> literally (case sensitive)
Global pattern flags
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

/
/
g

Test String