Regular Expressions 101

Group 1(\d\d)

\da digit

Character Class[\.\-\s]*

*matches any number of characters from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sany whitespace character

Group 2(.*)

.*any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

mp3the literal text mp3 (case sensitive)

$end of string, or before its final line terminator

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(\d\d)[\.\-\s]*(.*)\.mp3$

New

01 -Dirty Deeds Done Dirt Cheap.mp3

$1 $2.mp3