Regular Expressions 101

Explanation

Pro

^start of line

Character Class[A-Z]

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

Positive Lookahead(?=.?\d)

.?optionally matches any character (except for line terminators)

\da digit

Character Class[A-Z0-9 ]{0,8}

{0,8}matches between 0 and 8 characters from the set below:

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

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

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

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

Detailed match information will be displayed here automatically.

25 tokens

^[A-Z](?=.?\d)[A-Z0-9 ]{0,8}$

New

B1 8PT
SW12 TQ1
B12 TYP
A1AAAAAAA
AA1AAAAAA

B1 8PT
SW12 TQ1
B12 TYP
A1AAAAAAA
AA1AAAAAA