Regular Expressions 101

Pro

Group 1(\d{4}[-.()\/* ]*?(?:(?:x|ext)[:]?[ ]*\d+)?)

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

Character Class[-.()\/* ]*?

*?matches any number of characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:(?:x|ext)[:]?[ ]*\d+)?

?repeats the group contents below at most once:

Non-Capturing Group(?:x|ext)

1st Alternativex

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

2nd Alternativeext

extthe literal text ext (case sensitive)

Character Class[:]?

?matches at most one character from the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[ ]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\d+a digit, repeated at least once

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.

25 tokens

(\d{4}[-.()\/* ]*?(?:(?:x|ext)[:]?[ ]*\d+)?)

New

8910 ext 234
1234 x 5
2345 x 019234
2345

8910 ext 234
1234 x 5
2345 x 019234
2345