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

If I understand you correctly, you wish your regex to stand for strings which consist of a number group followed (optionally) by additional number groups with a - separator.

\d+      # represents a number group
(-\d+)*  # represents 0 or more additional number groups beginning with "-"

So, together with the necessary beginning and end of line assertions, together we have:

^\d+(-\d+)*$