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/

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

/

gm

1st Capturing Group

(1\s?)?

? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

1 matches the character 1 with index 49_{10} (31_{16} or 61_{8}) literally (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

2nd Capturing Group

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

1st Alternative

\d{3}

\d

matches a digit (equivalent to [0-9]){3} matches the previous token exactly 3 times

2nd Alternative

\(\d{3}\)

\( matches the character ( with index 40_{10} (28_{16} or 50_{8}) literally (case sensitive)

\d

matches a digit (equivalent to [0-9]){3} matches the previous token exactly 3 times

\) matches the character ) with index 41_{10} (29_{16} or 51_{8}) literally (case sensitive)

Match a single character present in the list below

[\-\s]

? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

\- matches the character - with index 45_{10} (2D_{16} or 55_{8}) literally (case sensitive)

\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])

\d

matches a digit (equivalent to [0-9]){3} matches the previous token exactly 3 times

Match a single character present in the list below

[\-\s]

\- matches the character - with index 45_{10} (2D_{16} or 55_{8}) literally (case sensitive)

\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])

\d

matches a digit (equivalent to [0-9]){4} matches the previous token exactly 4 times

Global pattern flags

g modifier: **g**lobal. All matches (don't return after first match)

m modifier: **m**ulti line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

Your regular expression does not match the subject string.

No Match

/

/

gm

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