Regular Expressions 101

^start of string

b{4}the literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive), repeated exactly 4 times

Character Class[0-9a-f]{28}

{28}matches exactly 28 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

$end of string, or before its final line terminator

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^b{4}[0-9a-f]{28}$

New

bbbb00000000000000170d0000306fb6

bbbb00000000000000170d0000306fb6