Regular Expressions 101

Pro

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

\$+?the literal $ (36₁₀ / 44₈ / 24₁₆) , repeated at least once

Non-Capturing Group(?:[A-Fa-f]*)?

?repeats the group contents below at most once:

Character Class[A-Fa-f]*

*matches any number of characters from the set below:

A-Fone character from A (65₁₀) to F (70₁₀) (case sensitive)

a-fone character from a (97₁₀) to f (102₁₀) (case sensitive)

Non-Capturing Group(?:\d)*

*repeats the group contents below any number of times:

\da digit

Detailed match information will be displayed here automatically.

26 tokens

-?\$+?(?:[A-Fa-f]*)?(?:\d)*

New

$0
$1
$D
$FFFF
$0A1B2C3D4E5F
$BadCafe
-$10
-$aBcDeF

$0
$1
$D
$FFFF
$0A1B2C3D4E5F
$BadCafe
-$10
-$aBcDeF