Regular Expressions 101

^start of line

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

Group 1(\d{3})

\d{3}a digit, repeated exactly 3 times

\)?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(\d{3})

\d{3}a digit, repeated exactly 3 times

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(\d{4})

\d{4}a digit, repeated exactly 4 times

Group 4( x\d{4})?

?repeats the group contents below at most once:

xthe literal text x (case sensitive)

\d{4}a digit, repeated exactly 4 times

$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

^\(?(\d{3})\)?[-\. ]?(\d{3})[-\. ]?(\d{4})( x\d{4})?$

New

123-123-1234 x1234

(123) 123-1234 x1234

1231231234 x1234
123-123-1234