Regular Expressions 101

change://the literal text change:// (case sensitive)

Non-Capturing Group(?:problem/)?

?repeats the group contents below at most once:

problem/the literal text problem/ (case sensitive)

Group 1(\d+)

\d+a Unicode decimal digit, repeated at least once

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

change://(?:problem/)?(\d+)

New

<change://problem/59689726> This is a test1
change://1234567 This is a test2