Regular Expressions 101

Pro

^start of line

Character Class[-\d]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

Non-Capturing Group(?:-|\B\d){4}

{4}repeats the group contents below exactly 4 times:

1st Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative\B\d

\Bnot an ASCII word boundary

\da digit

Character Class[A-Z\d-]*

*matches any number of characters from the set below:

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

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$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

^[-\d](?:-|\B\d){4}[A-Z\d-]*$

New

12345ABC
12345123
1234-1
1234--1
1----1AB
-----
--1--BB
----1-
1-1--11