regex101: UK Postcode checker

^start of string

Group 1(GIR ?0AA|[A-PR-UWYZ]([0-9]{1,2}|([A-HK-Y][0-9]([0-9ABEHMNPRV-Y])?)|[0-9][A-HJKPS-UW]) ?[0-9][ABD-HJLNP-UW-Z]{2})

1st AlternativeGIR ?0AA

GIRthe literal text GIR (case sensitive)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

0AAthe literal text 0AA (case sensitive)

2nd Alternative[A-PR-UWYZ]([0-9]{1,2}|([A-HK-Y][0-9]([0-9ABEHMNPRV-Y])?)|[0-9][A-HJKPS-UW]) ?[0-9][ABD-HJLNP-UW-Z]{2}

Character Class[A-PR-UWYZ]

A-Pone character from A (65₁₀) to P (80₁₀) (case sensitive)

R-Uone character from R (82₁₀) to U (85₁₀) (case sensitive)

Wthe literal W (87₁₀ / 127₈ / 57₁₆) (case sensitive)

Ythe literal Y (89₁₀ / 131₈ / 59₁₆) (case sensitive)

Zthe literal Z (90₁₀ / 132₈ / 5A₁₆) (case sensitive)

Group 2([0-9]{1,2}|([A-HK-Y][0-9]([0-9ABEHMNPRV-Y])?)|[0-9][A-HJKPS-UW])

1st Alternative[0-9]{1,2}

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

2nd Alternative([A-HK-Y][0-9]([0-9ABEHMNPRV-Y])?)

Group 3([A-HK-Y][0-9]([0-9ABEHMNPRV-Y])?)

Character Class[A-HK-Y]

A-Hone character from A (65₁₀) to H (72₁₀) (case sensitive)

K-Yone character from K (75₁₀) to Y (89₁₀) (case sensitive)

Character Class[0-9]

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

Group 4([0-9ABEHMNPRV-Y])?

?repeats the group contents below at most once:

Character Class[0-9ABEHMNPRV-Y]

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

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

Bthe literal B (66₁₀ / 102₈ / 42₁₆) (case sensitive)

Ethe literal E (69₁₀ / 105₈ / 45₁₆) (case sensitive)

Hthe literal H (72₁₀ / 110₈ / 48₁₆) (case sensitive)

Mthe literal M (77₁₀ / 115₈ / 4D₁₆) (case sensitive)

Nthe literal N (78₁₀ / 116₈ / 4E₁₆) (case sensitive)

Pthe literal P (80₁₀ / 120₈ / 50₁₆) (case sensitive)

Rthe literal R (82₁₀ / 122₈ / 52₁₆) (case sensitive)

V-Yone character from V (86₁₀) to Y (89₁₀) (case sensitive)

3rd Alternative[0-9][A-HJKPS-UW]

Character Class[0-9]

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

Character Class[A-HJKPS-UW]

A-Hone character from A (65₁₀) to H (72₁₀) (case sensitive)

Jthe literal J (74₁₀ / 112₈ / 4A₁₆) (case sensitive)

Kthe literal K (75₁₀ / 113₈ / 4B₁₆) (case sensitive)

Pthe literal P (80₁₀ / 120₈ / 50₁₆) (case sensitive)

S-Uone character from S (83₁₀) to U (85₁₀) (case sensitive)

Wthe literal W (87₁₀ / 127₈ / 57₁₆) (case sensitive)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[0-9]

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

Character Class[ABD-HJLNP-UW-Z]{2}

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

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

Bthe literal B (66₁₀ / 102₈ / 42₁₆) (case sensitive)

D-Hone character from D (68₁₀) to H (72₁₀) (case sensitive)

Jthe literal J (74₁₀ / 112₈ / 4A₁₆) (case sensitive)

Lthe literal L (76₁₀ / 114₈ / 4C₁₆) (case sensitive)

Nthe literal N (78₁₀ / 116₈ / 4E₁₆) (case sensitive)

P-Uone character from P (80₁₀) to U (85₁₀) (case sensitive)

W-Zone character from W (87₁₀) to Z (90₁₀) (case sensitive)

$end of string, or before its final line terminator

25 tokens

Regular Expression

^(GIR ?0AA|[A-PR-UWYZ]([0-9]{1,2}|([A-HK-Y][0-9]([0-9ABEHMNPRV-Y])?)|[0-9][A-HJKPS-UW]) ?[0-9][ABD-HJLNP-UW-Z]{2})$

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Regular Expressions 101

Regular Expression

Extraction