Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:1\s?)?

?repeats the group contents below at most once:

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\s?optionally matches any whitespace character

Non-Capturing Group(?:$\d{3}$|\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:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sany whitespace character

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

Character Class[-\s]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sany whitespace character

\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.

26 tokens

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

New

1 (555)555-5555


555)-555-5555
(555-555-5555