Regular Expressions 101

Explanation

Pro

^start of line

Group 1((?:[0-9]{8})(?:[a-z]|[A-Z])|(?:[a-z]|[A-Z])(?:[0-9]{8})|(?:[a-z]|[A-Z])[0-9]{7}(?:[a-z]|[A-Z]))

1st Alternative(?:[0-9]{8})(?:[a-z]|[A-Z])

Non-Capturing Group(?:[0-9]{8})

Character Class[0-9]{8}

{8}matches exactly 8 characters from the set below:

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

Non-Capturing Group(?:[a-z]|[A-Z])

1st Alternative[a-z]

Character Class[a-z]

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

2nd Alternative[A-Z]

Character Class[A-Z]

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

2nd Alternative(?:[a-z]|[A-Z])(?:[0-9]{8})

Non-Capturing Group(?:[a-z]|[A-Z])

1st Alternative[a-z]

Character Class[a-z]

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

2nd Alternative[A-Z]

Character Class[A-Z]

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

Non-Capturing Group(?:[0-9]{8})

Character Class[0-9]{8}

{8}matches exactly 8 characters from the set below:

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

3rd Alternative(?:[a-z]|[A-Z])[0-9]{7}(?:[a-z]|[A-Z])

Non-Capturing Group(?:[a-z]|[A-Z])

1st Alternative[a-z]

Character Class[a-z]

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

2nd Alternative[A-Z]

Character Class[A-Z]

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

Character Class[0-9]{7}

{7}matches exactly 7 characters from the set below:

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

Non-Capturing Group(?:[a-z]|[A-Z])

1st Alternative[a-z]

2nd Alternative[A-Z]

$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

Unit Test Summary

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Quick Reference

25 tokens

Regular Expression

^((?:[0-9]{8})(?:[a-z]|[A-Z])|(?:[a-z]|[A-Z])(?:[0-9]{8})|(?:[a-z]|[A-Z])[0-9]{7}(?:[a-z]|[A-Z]))$

Unit Tests

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