Regular Expressions 101

Explanation

Pro

^start of string

GBthe literal text GB (case sensitive)

Group 1([0-9]{9}([0-9]{3})?|[A-Z]{2}[0-9]{3})

1st Alternative[0-9]{9}([0-9]{3})?

Character Class[0-9]{9}

{9}matches exactly 9 characters from the set below:

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

Group 2([0-9]{3})?

?repeats the group contents below at most once:

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

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

2nd Alternative[A-Z]{2}[0-9]{3}

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[0-9]{3}

{3}matches exactly 3 characters from the set below:

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

$end of string, or before its final line terminator

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

^GB([0-9]{9}([0-9]{3})?|[A-Z]{2}[0-9]{3})$

New

GBHA599