Question

I’m using regexp to parse a string of a certain syntax.

Pattern.compile("(\\d+)(d)(\\d+)(([\\+\\-\\*\\/])(\\d+))*"); // The regexp pattern

I want this to match strings like:

2d6
4d4+1
2d12*2-1

The problem is, it also matches strings that end on a x-*/ such as:

3d4-

Answer 1

use this regex (\d+)(d)(\d+)(([-+*/])(\d+))

but 2d12x2-1 would not be match, x is not exist in your regex, and you don’t say about it anything, for include x change regex to (\d+)(d)([\dx]+)(([\+\-\*\/])(\d+))

Edit:

may be you need anchor? set ^ and $ in your regex

Pattern.compile("^(\\d+)(d)(\\d+)(([-+*/])(\\d+))*$");