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

$1 $2

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