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1?\(?([0-9]{3})\)?[-.\s]?([0-9]{3})[-.\s]?([0-9]{4})

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1

matches the character 1 with index 49\(

matches the character ( with index 40? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

1st Capturing Group

([0-9]{3})

Match a single character present in the list below

[0-9]

{3} matches the previous token exactly 3 times

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

\)

matches the character ) with index 41? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

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 a single character in the list -. (case sensitive)\s matches any whitespace character (equivalent to [\r\n\t\f\v ])

2nd Capturing Group

([0-9]{3})

Match a single character present in the list below

[0-9]

{3} matches the previous token exactly 3 times

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

Match a single character present in the list below

[-.\s]

-.

matches a single character in the list -. (case sensitive)\s matches any whitespace character (equivalent to [\r\n\t\f\v ])

3rd Capturing Group

([0-9]{4})

Match a single character present in the list below

[0-9]

{4} matches the previous token exactly 4 times

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

Your regular expression does not match the subject string.Try launching the debugger to find out why.

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