Regular Expressions 101

Pro

^start of line

Character Class[A-Z]{2}

{2}matches exactly 2 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Group 1([A-Z]{2})?

?repeats the group contents below at most once:

Character Class[A-Z]{2}

{2}matches exactly 2 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[1-4]

1-4one character from 1 (49₁₀) to 4 (52₁₀)

$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

^[A-Z]{2}([A-Z]{2})?[1-4]$

New

AA1
ZZ4
AB5
AABB1
ABCD4
ABCD9