Evaluate dice rolling notation strings

Question

Rules

Write a function that accepts string as a parameter, returning evaluated value of expression in dice notation, including addition and multiplication.

To

Answer 1

Python 124 chars with eval, 154 without.

Just to show python doesn't have to be readable, here's a 124 character solution, with a similar eval-based approach to the original:

import random,re
f=lambda s:eval(re.sub(r'(\d*)d(\d+)',lambda m:int(m.group(1)or 1)*('+random.randint(1,%s)'%m.group(2)),s))

[Edit] And here's a 154 character one without eval:

import random,re
f=lambda s:sum(int(c or 0)+sum(random.randint(1,int(b))for i in[0]*int(a or 1))for a,b,c in re.findall(r'(\d*)d(\d+)(\s*[+-]\s*\d+)?',s))

Note: both will work for inputs like "2d6 + 1d3 + 5" but don't support more advanced variants like "2d3d6" or negative dice ("1d6-4" is OK, but "1d6-2d4" isn't) (You can shave off 2 characters to not support negative numbers at all in the second one instead)