Regular Expressions 101

^start of line

\(?optionally matches the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 1([0-9]{3})

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

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

\)?optionally matches the literal ) (41₁₀ / 51₈ / 29₁₆)

Character Class[-. ]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Group 2([0-9]{3})

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

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

Non-Capturing Group(?:[-. ]?([0-9]{4}))?

?repeats the group contents below at most once:

Character Class[-. ]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Group 3([0-9]{4})

Character Class[0-9]{4}

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

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

Non-Capturing Group(?:[#. ]+([0-9]{1,10}))?

?repeats the group contents below at most once:

Character Class[#. ]+

+matches at least one character from the set below:

#the literal # (35₁₀ / 43₈ / 23₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Group 4([0-9]{1,10})

Character Class[0-9]{1,10}

{1,10}matches between 1 and 10 characters from the set below:

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

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^\(?([0-9]{3})\)?[-. ]?([0-9]{3})(?:[-. ]?([0-9]{4}))?(?:[#. ]+([0-9]{1,10}))?$

Test String
New

Examples:
(555) 555-1212
(555) 555-1212 #12525
 - Acceptable (Up to 10 digits after the # sign)
5555551212
555-555-1212
555-555-1212 #12525
 - Acceptable (Up to 10 digits after the # sign)

Any alpha characters should be Unacceptable
(555) 555-1212 ext 12525
(555) 555-1212 x12525

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...