Regular Expression for number and dash

Question

Currently I write the regex like this: /^([\\d+]*-)+([\\d]*-)+([\\d])*$/

I want the result follow this pattern 00-123-456-789 or 0012

Answer 1

From what have you provided us, this regex ^-?(\d+-?)+$ matches this

-00-123-456-789-
-00123456789-
00-123-456-789-
00123456789

but doesn't match this:

00-123--457-789

Breakdown:

• the string can start with a dash (^-?)
• it has some digits followed by an optional dash (\d+-?)
• the last group can be repeated one or more times ((\d+-?)+)
• the string ends ($)