Regular Expressions 101

Pro

^start of line

DKthe literal text DK (case sensitive)

Character Class[0-6]{4}

{4}matches exactly 4 characters from the set below:

0-6one character from 0 (48₁₀) to 6 (54₁₀)

$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

^DK[0-6]{4}$

New

The regex DK[0-9]{4} specifies that the input must start with "DK" and then be followed by 4 digits from 0 to 6

The following example values are valid:
DK0001
DK1323
DK6666

The following example values are invalid
DK0007
DK0009
DK 3434
DK232
DK1
DK01
DK001