regex101: US and Mexico Phone Numbers with Extensions

Pro

^start of line

Non-Capturing Group(?:(52\-)|(1\-))?

?repeats the group contents below at most once:

1st Alternative(52\-)

Group 1(52\-)

52the literal text 52

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative(1\-)

Group 2(1\-)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 3(\()?

?repeats the group contents below at most once:

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Condition(?(1)[0-9]{2,3}|[2-9][0-9]{2})

Uses the first branch if group 1 matched

If the condition is true, match this branch:[0-9]{2,3}

Character Class[0-9]{2,3}

{2,3}matches between 2 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Otherwise, match this branch:[2-9][0-9]{2}

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Condition(?(3)\)\s?|(\-|[.]|\s|))

Uses the first branch if group 3 matched

If the condition is true, match this branch:\)\s?

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\s?optionally matches any whitespace character

Otherwise, match this branch:(\-|[.]|\s|)

Group 4(\-|[.]|\s|)

1st Alternative\-

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative[.]

Character Class[.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

3rd Alternative\s

\sany whitespace character

4th Alternative — matches an empty string

Condition(?(1)[0-9]|[2-9])

Uses the first branch if group 1 matched

If the condition is true, match this branch:[0-9]

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Otherwise, match this branch:[2-9]

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

Character Class[0-9]{2}

Condition(?(4)\4|(?:\-|[.]|\s)?)

Character Class[0-9]{4}

Group 5(\s?(?:x|ext|ext.|extension|Ext|Ext.|Extension|#)\s?[0-9]+)?

$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

25 tokens

Regular Expression

^(?:(52\-)|(1\-))?(\()?(?(1)[0-9]{2,3}|[2-9][0-9]{2})(?(3)\)\s?|(\-|[.]|\s|))(?(1)[0-9]|[2-9])[0-9]{2}(?(4)\4|(?:\-|[.]|\s)?)[0-9]{4}(\s?(?:x|ext|ext.|extension|Ext|Ext.|Extension|#)\s?[0-9]+)?$

Unit Tests

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