Regular Expressions 101

Pro

1st Alternative^\d{2}-\d{7}$

^start of line

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{7}a digit, repeated exactly 7 times

$end of line

2nd Alternative\d{9}

\d{9}a digit, repeated exactly 9 times

3rd Alternative\d{3}(?<sep>[-\s])\d{2}\k<sep>\d{4}

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

Group sep(?<sep>[-\s])

Character Class[-\s]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sany whitespace character

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

\k<sep>the text saved by group sep

\d{4}a digit, repeated exactly 4 times

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.

26 tokens

^\d{2}-\d{7}$|\d{9}|\d{3}(?<sep>[-\s])\d{2}\k<sep>\d{4}

New

12-3456789
123456789
123 45 6789
123-45-6789

12-3456789
123456789
123 45 6789
123-45-6789