Regular Expressions 101

Non-Capturing Group(?:\b(?:tlf|mobile?|tel(?:ephone)?)[.:\s]+)?

?repeats the group contents below at most once:

\ba Unicode word boundary

Non-Capturing Group(?:tlf|mobile?|tel(?:ephone)?)

1st Alternativetlf

tlfthe literal text tlf (case sensitive)

2nd Alternativemobile?

mobilthe literal text mobil (case sensitive)

e?optionally matches the literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

3rd Alternativetel(?:ephone)?

telthe literal text tel (case sensitive)

Non-Capturing Group(?:ephone)?

?repeats the group contents below at most once:

ephonethe literal text ephone (case sensitive)

Character Class[.:\s]+

+matches at least one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sa Unicode whitespace character

Non-Capturing Group(?:$\+45$|\+45)?

?repeats the group contents below at most once:

1st Alternative$\+45$

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

45the literal text 45

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative\+45

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

45the literal text 45

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

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

Non-Capturing Group(?:\s?\d{2}){3}

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

\s?optionally matches a Unicode whitespace character

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

Negative Lookahead(?!\d)

\da Unicode decimal digit

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

(?:\b(?:tlf|mobile?|tel(?:ephone)?)[.:\s]+)?(?:\(\+45\)|\+45)?\s*\d{2}(?:\s?\d{2}){3}(?!\d)

New

lkdjkljlkaf tel.: +45 09827374, +45 89895867, some kind of text... 
mobil: +45 20802020, +45 20802001,
afsdfadsf tlf.: +45 5555 1212 
tlf: +4567890202Girrafe

Regular Expression

Substitution