Regular Expressions 101

Explanation

Pro

Negative Lookbehind(?<![\dA-Z])

Character Class[\dA-Z]

\da Unicode decimal digit

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

Negative Lookahead(?!\d{2})

\d{2}a Unicode decimal digit, repeated exactly 2 times

Character Class[A-Z\d]{2}

{2}matches exactly 2 characters from the set below:

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

\da Unicode decimal digit

\s?optionally matches a Unicode whitespace character

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

Negative Lookahead(?!\d)

\da Unicode decimal digit

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

(?<![\dA-Z])(?!\d{2})[A-Z\d]{2}\s?\d{2,4}(?!\d)

New

AA312fgAA312deRAA3123#AA3123rrAA31244dA3312fg5A 312deRAA3123#AA 3123rrAA31244

AA312fgAA312deRAA3123#AA3123rrAA31244dA3312fg5A 312deRAA3123#AA 3123rrAA31244