Regular Expressions 101

Explanation

Pro

Positive Lookahead(?=([A-Z]\d{2,4}(?:[A-Z](?!\d{2,4}))?))

Group 1([A-Z]\d{2,4}(?:[A-Z](?!\d{2,4}))?)

Character Class[A-Z]

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

\d{2,4}a digit, repeated between 2 and 4 times

Non-Capturing Group(?:[A-Z](?!\d{2,4}))?

?repeats the group contents below at most once:

Character Class[A-Z]

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

Negative Lookahead(?!\d{2,4})

\d{2,4}a digit, repeated between 2 and 4 times

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

Detailed match information will be displayed here automatically.

25 tokens

(?=([A-Z]\d{2,4}(?:[A-Z](?!\d{2,4}))?))

New

F328AG560F33
F328AG560F3

F328AG560F33
F328AG560F3