Regular Expressions 101

^start of line

Positive Lookahead(?=\S+ ?\S+$)

\S+any non-whitespace character, repeated at least once

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

\S+any non-whitespace character, repeated at least once

$end of line

\da digit

Non-Capturing Group(?: ?\d){3}

{3}repeats the group contents below exactly 3 times:

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

\da digit

Character Class[a-zA-Z ]{2,3}

{2,3}matches between 2 and 3 characters from the set below:

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

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

the literal (32₁₀ / 40₈ / 20₁₆)

$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.

Search reference

Regular Expression

^(?=\S+ ?\S+$)\d(?: ?\d){3}[a-zA-Z ]{2,3}$

New

1111 ZZ
111 1ZZ
11 11ZZ
1 111ZZ
1111ZZ
1111 ZZ

9999 1A
11111 Z
1111111
11 11 ZZ
1111 AAA
11 1A