Regular Expressions 101

^start of string

Group 1((\d{5}-\d{4})|(\d{5})|([A-Z]\d[A-Z]\s\d[A-Z]\d))

1st Alternative(\d{5}-\d{4})

Group 2(\d{5}-\d{4})

\d{5}a digit, repeated exactly 5 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{4}a digit, repeated exactly 4 times

2nd Alternative(\d{5})

Group 3(\d{5})

\d{5}a digit, repeated exactly 5 times

3rd Alternative([A-Z]\d[A-Z]\s\d[A-Z]\d)

Group 4([A-Z]\d[A-Z]\s\d[A-Z]\d)

Character Class[A-Z]

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

\da digit

Character Class[A-Z]

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

\sany whitespace character

\da digit

Character Class[A-Z]

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

\da digit

$end of string, or before its final line terminator

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^((\d{5}-\d{4})|(\d{5})|([A-Z]\d[A-Z]\s\d[A-Z]\d))$

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