Regular Expressions 101

Pro

^start of line

UC-000the literal text UC-000 (case sensitive)

Non-Capturing Group(?:0\d|[1-9]\d*)

1st Alternative0\d

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\da digit

2nd Alternative[1-9]\d*

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d*a digit, repeated any number of times

$end of line

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.

25 tokens

^UC-000(?:0\d|[1-9]\d*)$

New

UC-00001
UC-00012
UC-000100

UC-00001
UC-00010
UC-00000
UC-000010
UC-0000100