Regular Expressions 101

Pro

Group 1([a-zA-Z][a-zA-Z0-9]{1,3})

Character Class[a-zA-Z]

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

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

Character Class[a-zA-Z0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

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

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

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Group 2(\d[a-zA-Z]{2})

\da digit

Character Class[a-zA-Z]{2}

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

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

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

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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-zA-Z][a-zA-Z0-9]{1,3}) ?(\d[a-zA-Z]{2})

New

EC1A 1BB
A9A 9AA
A9 9AA
A99 9AA
AA9 9AA
AA99 9AA
EC1A1BB
A9A9AA
A99AA
A999AA
AA99AA
AA999AA

EC1A 1BB
A9A 9AA
A9 9AA
A99 9AA
AA9 9AA
AA99 9AA
EC1A1BB
A9A9AA
A99AA
A999AA
AA99AA
AA999AA