Regular Expressions 101

Group 1(X(-|\.)?0?\d{7}(-|\.)?[A-Z]|[A-Z](-|\.)?\d{7}(-|\.)?[0-9A-Z]|\d{8}(-|\.)?[A-Z])

1st AlternativeX(-|\.)?0?\d{7}(-|\.)?[A-Z]

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case insensitive)

Group 2(-|\.)?

?repeats the group contents below at most once:

1st Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

\d{7}a digit, repeated exactly 7 times

Group 3(-|\.)?

?repeats the group contents below at most once:

1st Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[A-Z]

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

2nd Alternative[A-Z](-|\.)?\d{7}(-|\.)?[0-9A-Z]

Character Class[A-Z]

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

Group 4(-|\.)?

?repeats the group contents below at most once:

1st Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{7}a digit, repeated exactly 7 times

Group 5(-|\.)?

?repeats the group contents below at most once:

1st Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9A-Z]

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

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

3rd Alternative\d{8}(-|\.)?[A-Z]

\d{8}a digit, repeated exactly 8 times

Group 6(-|\.)?

?repeats the group contents below at most once:

1st Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[A-Z]

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

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(X(-|\.)?0?\d{7}(-|\.)?[A-Z]|[A-Z](-|\.)?\d{7}(-|\.)?[0-9A-Z]|\d{8}(-|\.)?[A-Z])$

Regular Expressions 101

Regular Expression

Test String
New

Substitution
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Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
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