Regular Expressions 101

Explanation

Pro

^start of line

Character Class[A-Z]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

\d{1,2}a digit, repeated between 1 and 2 times

Non-Capturing Group(?:(?: )?\d[A-Z]{2})?

?repeats the group contents below at most once:

Non-Capturing Group(?: )?

?repeats the group contents below at most once:

the literal (32₁₀ / 40₈ / 20₁₆)

\da digit

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)

$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]{1,2}\d{1,2}(?:(?: )?\d[A-Z]{2})?$

New

AA9
AA99
AA9 9ZZ
AA99 9ZZ

AA9
AA99
AA9 9ZZ
AA99 9ZZ