Regular Expressions 101

Pro

^start of line

\ban ASCII word boundary

\d?optionally matches a digit

Non-Capturing Group(?:[A-Z]\d)*

*repeats the group contents below any number of times:

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\da digit

Character Class[A-Z]?

?matches at most one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

$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

^\b\d?(?:[A-Z]\d)*[A-Z]?$

New

D1B2C4Q3
DDA1Q3
D$1A2B

1
11
A
AA
1A2B
1AA2
B2C33
B2C3D4
B2C3D4EE
B2C3D4E5G

D1B2C4Q3
DDA1Q3
D$1A2B

1
11
A
AA
1A2B
1AA2
B2C33
B2C3D4
B2C3D4EE
B2C3D4E5G