regex101: Regex to capture AlphaNumeric String of 7 or 11 length(Must contain at least one Alphabet and Must contain at least one

\sany whitespace character

Positive Lookahead(?=\w*[0-9])

\w*any word character, repeated any number of times

Character Class[0-9]

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

Positive Lookahead(?=\w*[A-Z])

\w*any word character, repeated any number of times

Character Class[A-Z]

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

Group 1([A-Z\d]{11}|[A-Z\d]{7})

1st Alternative[A-Z\d]{11}

Character Class[A-Z\d]{11}

{11}matches exactly 11 characters from the set below:

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

\da digit

2nd Alternative[A-Z\d]{7}

Character Class[A-Z\d]{7}

{7}matches exactly 7 characters from the set below:

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

\da digit

\sany whitespace character

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Search reference

Regular Expression

\s(?=\w*[0-9])(?=\w*[A-Z])([A-Z\d]{11}|[A-Z\d]{7})\s

New

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Regular Expressions 101

Regular Expression

Extraction