Regular Expressions 101

Explanation
Pro

Positive Lookbehind(?<=<user>)

<user>the literal text <user> (case sensitive)

\w+any word character, repeated at least once

Positive Lookahead(?=<\/user>)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

user>the literal text user> (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

(?<=<user>)\w+(?=<\/user>)

random data
<user>test1</user>
some more random data

not needed
<user>test2</user>
etc etc

random data
<user>test1</user>
some more random data

not needed
<user>test2</user>
etc etc