Regular Expressions 101

^start of string

Group 1(([A-Z][A-Z]{0,1})([0-9][A-Z0-9]{0,1}))

Group 2([A-Z][A-Z]{0,1})

Character Class[A-Z]

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

Character Class[A-Z]{0,1}

{0,1}matches at most one character from the set below:

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

Group 3([0-9][A-Z0-9]{0,1})

Character Class[0-9]

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

Character Class[A-Z0-9]{0,1}

{0,1}matches at most one character from the set below:

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

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

{0,}the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 4(([0-9])([A-Z]{2}))

Group 5([0-9])

Character Class[0-9]

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

Group 6([A-Z]{2})

Character Class[A-Z]{2}

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

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

$end of string, or before its final line terminator

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(([A-Z][A-Z]{0,1})([0-9][A-Z0-9]{0,1})) {0,}(([0-9])([A-Z]{2}))$

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SW1A 1AA