Regular Expressions 101

Pro

^start of line

Group 1(1)?

?repeats the group contents below at most once:

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Group 2(\s)?

?repeats the group contents below at most once:

\sany whitespace character

Group 3($\d{3}$|\d{3})

1st Alternative$\d{3}$

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative\d{3}

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

Character Class[\s-]?

?matches at most one character from the set below:

\sany whitespace character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

Character Class[\s-]?

?matches at most one character from the set below:

\sany whitespace character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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

Detailed match information will be displayed here automatically.

25 tokens

^(1)?(\s)?(\(\d{3}\)|\d{3})[\s-]?\d{3}[\s-]?\d{4}$

New

555-555-5555
555-555-55555
1 555-555-5555

555-555-5555
555-555-55555
1 555-555-5555