Regular Expressions 101

identifier:the literal text identifier: (case sensitive)

Group 1([0-9]*)

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

identifier:([0-9]*)

https://test.com/identifier:1234?item=123