Regular Expressions 101

^start of line

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

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

{3}repeats the group contents below exactly 3 times:

Non-Capturing Group(?:[ \.\-]?)

Character Class[ \.\-]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^\d{3}(?:(?:[ \.\-]?)\d{2}){3}$

New

123456789
123 45 67 89
123.45.67.89
123-45-67-89
1234
1341234311341324