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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

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

New

"1-2-3-4-5-6" => no
"1-2-3-4-5"   => yes match 1
"1-2-3-4"     => yes match 2
"1-2-3"       => no
"123456"      => no
"12345"       => yes match 3
"1234"        => yes match 4
"123"         => no
foo 123 56 78 bar
"0000" will become "****"
"any text 000 00 more texts" will become "any text ***** more texts"..notice that the space is removed
"any text 000 00 more texts 00" will become "any text ***** more texts 00"

"any text 000 00 more texts 00 00" will become "any text ***** more texts ****"

"any text 00-00 more texts 00_00" will become "any text **** more texts ****"
a  0  12345    fdf