Regular Expressions 101

Explanation

Pro

1st Alternative(?:(?:\d[- _]*){6,})

Non-Capturing Group(?:(?:\d[- _]*){6,})

Non-Capturing Group(?:\d[- _]*){6,}

{6,}repeats the group contents below at least 6 times:

\da digit

Character Class[- _]*

*matches any number of characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

2nd Alternative(?<num_1>\d[- _]*)(?<num_2>\d[- _]*)(?<num_3>\d[- _]*)(?<num_4>\d)(?<num_5>[- _]*\d)?

Group num_1(?<num_1>\d[- _]*)

\da digit

Character Class[- _]*

*matches any number of characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group num_2(?<num_2>\d[- _]*)

\da digit

Character Class[- _]*

*matches any number of characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group num_3(?<num_3>\d[- _]*)

\da digit

Character Class[- _]*

*matches any number of characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group num_4(?<num_4>\d)

\da digit

Group num_5(?<num_5>[- _]*\d)?

?repeats the group contents below at most once:

Character Class[- _]*

*matches any number of characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\da digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Unit Test Summary

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Quick Reference

25 tokens

Regular Expression

(?:(?:\d[- _]*){6,})|(?<num_1>\d[- _]*)(?<num_2>\d[- _]*)(?<num_3>\d[- _]*)(?<num_4>\d)(?<num_5>[- _]*\d)?

Unit Tests

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