regex101: UK PostCode Validation

Pro

1st Alternative^([Gg][Ii][Rr] 0[Aa]{2})

^start of line

Group 1([Gg][Ii][Rr] 0[Aa]{2})

Character Class[Gg]

Gthe literal G (71₁₀ / 107₈ / 47₁₆) (case insensitive)

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case insensitive)

Character Class[Ii]

Ithe literal I (73₁₀ / 111₈ / 49₁₆) (case insensitive)

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case insensitive)

Character Class[Rr]

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

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case insensitive)

0the literal text 0

Character Class[Aa]{2}

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

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

athe literal a (97₁₀ / 141₈ / 61₁₆) (case insensitive)

2nd Alternative((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z]))))\s?[0-9][A-Za-z]{2})$

Group 2((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z]))))\s?[0-9][A-Za-z]{2})

Group 3(([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z]))))

1st Alternative([A-Za-z][0-9]{1,2})

Group 4([A-Za-z][0-9]{1,2})

Character Class[A-Za-z]

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

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

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-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z])))

Group 5(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z])))

1st Alternative([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})

Group 6([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})

Character Class[A-Za-z]

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

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

Character Class[A-Ha-hJ-Yj-y]

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

a-hone character from a (97₁₀) to h (104₁₀) (case insensitive)

J-Yone character from J (74₁₀) to Y (89₁₀) (case insensitive)

j-yone character from j (106₁₀) to y (121₁₀) (case insensitive)

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(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z]))

Group 7(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z]))

1st Alternative([AZa-z][0-9][A-Za-z])

Group 8([AZa-z][0-9][A-Za-z])

Character Class[AZa-z]

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

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

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

Character Class[0-9]

Character Class[A-Za-z]

2nd Alternative([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z])

\s?optionally matches a Unicode whitespace character

Character Class[0-9]

Character Class[A-Za-z]{2}

$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

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

25 tokens

Regular Expression

^([Gg][Ii][Rr] 0[Aa]{2})|((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([AZa-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z]))))\s?[0-9][A-Za-z]{2})$

New

E18NS
m20 5qj
BS3 1JP
bs3 1jp
m5 8wa
m205qj
Bs31JP
sn55aw
sn5 5aw