Regular Expressions 101

1st Alternative\border(?:\s*number)?\W*\d+(*SKIP)(*F)

\ban ASCII word boundary

orderthe literal text order (case insensitive)

Non-Capturing Group(?:\s*number)?

?repeats the group contents below at most once:

\s*any whitespace character, repeated any number of times

numberthe literal text number (case insensitive)

\W*any non-word character, repeated any number of times

\d+a digit, repeated at least once

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*F)forces the current match attempt to fail at this position

2nd Alternative(?<!x)(?=(?:[._ –-]*\d){9})(?!9|66\D*6|00\D*0|(?:\d\D*){3}0\D*0|(?:\d\D*){5}0(?:\D*0){3})\d(?:[._ –-]*\d){4}

Negative Lookbehind(?<!x)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case insensitive)

Positive Lookahead(?=(?:[._ –-]*\d){9})

Non-Capturing Group(?:[._ –-]*\d){9}

{9}repeats the group contents below exactly 9 times:

Character Class[._ –-]*

*matches any number of characters from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

–the literal – (8211₁₀ / 20023₈ / 2013₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

Negative Lookahead(?!9|66\D*6|00\D*0|(?:\d\D*){3}0\D*0|(?:\d\D*){5}0(?:\D*0){3})

1st Alternative9

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

2nd Alternative66\D*6

66the literal text 66

\D*any character that's not a digit, repeated any number of times

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

3rd Alternative00\D*0

00the literal text 00

\D*any character that's not a digit, repeated any number of times

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

4th Alternative(?:\d\D*){3}0\D*0

Non-Capturing Group(?:\d\D*){3}

{3}repeats the group contents below exactly 3 times:

\da digit

\D*any character that's not a digit, repeated any number of times

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\D*any character that's not a digit, repeated any number of times

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

5th Alternative(?:\d\D*){5}0(?:\D*0){3}

Non-Capturing Group(?:\d\D*){5}

{5}repeats the group contents below exactly 5 times:

\da digit

\D*any character that's not a digit, repeated any number of times

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Non-Capturing Group(?:\D*0){3}

{3}repeats the group contents below exactly 3 times:

\D*any character that's not a digit, repeated any number of times

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\da digit

Non-Capturing Group(?:[._ –-]*\d){4}

{4}repeats the group contents below exactly 4 times:

Character Class[._ –-]*

*matches any number of characters from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

–the literal – (8211₁₀ / 20023₈ / 2013₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

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

x

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25 tokens

Regular Expression

\border(?:\s*number)?\W*\d+(*SKIP)(*F)|(?<!x)(?=(?:[._ –-]*\d){9})(?!9|66\D*6|00\D*0|(?:\d\D*){3}0\D*0|(?:\d\D*){5}0(?:\D*0){3})\d(?:[._ –-]*\d){4}

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