Regular Expressions 101

Pro

1st Alternative^(?:GB\d{2}[A-Z]{4}\d{14}|DE\d{20})

^start of line

Non-Capturing Group(?:GB\d{2}[A-Z]{4}\d{14}|DE\d{20})

1st AlternativeGB\d{2}[A-Z]{4}\d{14}

GBthe literal text GB (case sensitive)

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

Character Class[A-Z]{4}

{4}matches exactly 4 characters from the set below:

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

\d{14}a digit, repeated exactly 14 times

2nd AlternativeDE\d{20}

DEthe literal text DE (case sensitive)

\d{20}a digit, repeated exactly 20 times

2nd Alternative(?!DE|GB)[A-Z]{2}[A-Z\d]{13,}$

Negative Lookahead(?!DE|GB)

1st AlternativeDE

DEthe literal text DE (case sensitive)

2nd AlternativeGB

GBthe literal text GB (case sensitive)

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)

Character Class[A-Z\d]{13,}

{13,}matches at least 13 characters from the set below:

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

\da digit

$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.

26 tokens

Regular Expression

^(?:GB\d{2}[A-Z]{4}\d{14}|DE\d{20})|(?!DE|GB)[A-Z]{2}[A-Z\d]{13,}$

New

works as expected
DE12312341212312312312
GB12ASDF12312312312311

this should match with fallback
NO1212121212121
BG18RZBB91550123456789

this should not match with fallback:
DE1231234121231
GB1231231231231