Regular Expressions 101

Explanation

Pro

1st Alternative(^[0-9]{5}(-[0-9]{4})?$)

Group 1(^[0-9]{5}(-[0-9]{4})?$)

^start of string

Character Class[0-9]{5}

{5}matches exactly 5 characters from the set below:

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

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

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]{4}

{4}matches exactly 4 characters from the set below:

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

$end of string

2nd Alternative(^[ABCEGHJKLMNPRSTVXY]{1}[0-9]{1}[A-Z]{1} *[0-9]{1}[A-Z]{1}[0-9]{1}$)

Group 3(^[ABCEGHJKLMNPRSTVXY]{1}[0-9]{1}[A-Z]{1} *[0-9]{1}[A-Z]{1}[0-9]{1}$)

^start of string

Character Class[ABCEGHJKLMNPRSTVXY]{1}

{1}matches one character from the set below:

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

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

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case insensitive)

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

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

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

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

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

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

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

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

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

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

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case insensitive)

Tthe literal T (84₁₀ / 124₈ / 54₁₆) (case insensitive)

Vthe literal V (86₁₀ / 126₈ / 56₁₆) (case insensitive)

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

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

Character Class[0-9]{1}

{1}matches one character from the set below:

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

Character Class[A-Z]{1}

{1}matches one character from the set below:

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

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Character Class[0-9]{1}

{1}matches one character from the set below:

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

Character Class[A-Z]{1}

{1}matches one character from the set below:

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

Character Class[0-9]{1}

{1}matches one character from the set below:

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

$end of string

Global pattern flags

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

d modifier: indices. The JavaScript regex engine returns the indices at which the regex matched in the subject string

Unit Test Summary

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Quick Reference

26 tokens

Regular Expression

(^[0-9]{5}(-[0-9]{4})?$)|(^[ABCEGHJKLMNPRSTVXY]{1}[0-9]{1}[A-Z]{1} *[0-9]{1}[A-Z]{1}[0-9]{1}$)

Unit Tests

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