regex101: PCRE2 (PHP) Match Workspace

Pro

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

Negative Lookahead(?!.*[A-Z]{2})+?

+?repeats the group contents below at least once:

.*any character (except for line terminators), repeated any number of times

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)

.*any character (except for line terminators), repeated any number of times

Group 1(\d+)

\d+a digit, repeated at least once

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

25 tokens

Regular Expression

A(?!.*[A-Z]{2})+?.*(\d+)

New

A bcd 1  should match
Abcd1  should match
A bcd   should not match because there is no number
A bCD 1  should not match because there is capital C between the A and the number 
A bcd 1  B should match because `1` is before the B

Extraction

A bcd 1  should match
Abcd1  should match
A bcd   should not match because there is no number
A bCD 1  should not match because there is capital C between the A and the number 
A bcd 1  B should match because `1` is before the B