regex101: a

Pro

^start of line

Non-Capturing Group(?:\+)?

?repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

Positive Lookahead(?=(\d[\s\-\.]*){7,})

Group 1(\d[\s\-\.]*){7,}

{7,}repeats the group contents below at least 7 times:

\da digit

Character Class[\s\-\.]*

*matches any number of characters from the set below:

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\sany whitespace character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2([0-9\s\-\.]{5,})

Character Class[0-9\s\-\.]{5,}

{5,}matches at least 5 characters from the set below:

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

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\sany whitespace character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:\s*(?:#|x\.?|ext\.?|extension)\s*([0-9\s\-\.]{2,}))?

?repeats the group contents below at most once:

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:#|x\.?|ext\.?|extension)

1st Alternative#

#the literal # (35₁₀ / 43₈ / 23₁₆)

2nd Alternativex\.?

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

3rd Alternativeext\.?

extthe literal text ext (case sensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

4th Alternativeextension

extensionthe literal text extension (case sensitive)

\s*any whitespace character, repeated any number of times

Group 3([0-9\s\-\.]{2,})

Character Class[0-9\s\-\.]{2,}

{2,}matches at least 2 characters from the set below:

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

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\sany whitespace character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

$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

26 tokens

Regular Expression

^(?:\+)?(?=(\d[\(\)\s\-\.]*){7,})([0-9\(\)\s\-\.]{5,})(?:\s*(?:#|x\.?|ext\.?|extension)\s*([0-9\(\)\s\-\.]{2,}))?$

1234567
01822 853560
+44712345678
01234 ext 6666
+(44)234 456789
72823.278282
238293 329923 23992
32939(2323)(283)
23823-23-232