Regular Expressions 101

Pro

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Group 1((?:Student)?ID)

Non-Capturing Group(?:Student)?

?repeats the group contents below at most once:

Studentthe literal text Student (case sensitive)

IDthe literal text ID (case sensitive)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Group 2(\d+)

\d+a digit, repeated at least once

</the literal text </

\1the text saved by group 1

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

<((?:Student)?ID)>(\d+)</\1>

New

<StudentID>12345</StudentID>
Or it can be

<ID>12345</ID>
The input can be

<Somedata>SSS<Somedata><StudentID>12345</StudentID><Name>MMM</Name>