Regular Expressions 101

^start of line

Character Class[46]

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

Character Class[0-9]{6}

{6}matches exactly 6 characters from the set below:

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

Character Class[Xx0-9]

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

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

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

$end of line

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

Regular Expression

^[46][0-9]{6}[Xx0-9]$

New

41234568
4123456x
4234234X
62432434
6243243x

Length 8
Start with number 4 or 6
The remaining characters can be 7 numbers OR 6 numbers with an x at the end