Regular Expressions 101

Explanation

Pro

Character Class[+]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Negative Lookbehind(?<!\d)

\da digit

Negative Lookbehind(?<!\d[ -])

\da digit

Character Class[ -]

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?: ((\d{1,2}[ -]?)?[(]?\d{3}[)]?[ -]?) (\d(?:[ -]?\d){3,6}) )

Group 1((\d{1,2}[ -]?)?[(]?\d{3}[)]?[ -]?)

Group 2(\d{1,2}[ -]?)?

?repeats the group contents below at most once:

\d{1,2}a digit, repeated between 1 and 2 times

Character Class[ -]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[(]?

?matches at most one character from the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

Character Class[)]?

?matches at most one character from the set below:

)the literal ) (41₁₀ / 51₈ / 29₁₆)

Character Class[ -]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 3(\d(?:[ -]?\d){3,6})

\da digit

Non-Capturing Group(?:[ -]?\d){3,6}

{3,6}repeats the group contents below between 3 and 6 times:

Character Class[ -]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

Negative Lookahead(?![ -]?\d)

Character Class[ -]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

[+]?(?<!\d)(?<!\d[ -])
(?:
  ((\d{1,2}[ -]?)?[(]?\d{3}[)]?[ -]?)
  (\d(?:[ -]?\d){3,6})
)(?![ -]?\d)

New

Matches:
--------
 1234567 				 123 45 67 			 123-45-67 
 123456789012 		 	 12 345 678 9012 	 12-345-678-90-12 
 1 234 56 78 912  	 	 1 234 56 789 12 	 1 234 567 8 901 
 +1234567 
 +1234567890 			 +12-234 561 78 90	+12 234-561-78-90
 +123456789012    
 +1 234 561 78 90 
 1(234)567-89-01 
 (495)1234567 			 (495) 123 45 67 
 +33 (014)-020 53 17

Doesn't match: 
--------------
 +123456 			-- to short
 +1234567890123 	-- too long
 123 4567890123 	-- too long

Extraction

Matches:
--------
 1234567 				 123 45 67 			 123-45-67 
 123456789012 		 	 12 345 678 9012 	 12-345-678-90-12 
 1 234 56 78 912  	 	 1 234 56 789 12 	 1 234 567 8 901 
 +1234567 
 +1234567890 			 +12-234 561 78 90	+12 234-561-78-90
 +123456789012    
 +1 234 561 78 90 
 1(234)567-89-01 
 (495)1234567 			 (495) 123 45 67 
 +33 (014)-020 53 17

Doesn't match: 
--------------
 +123456 			-- to short
 +1234567890123 	-- too long
 123 4567890123 	-- too long