Regex to extract function-name, & it's parameters

Question

I am building an application where the user can specify an expression for some fields. The expression shall contain functions too. I need to evaluate these expressions and display final value in report.

I had an expression to extract function-name & it's paramters. Previously, the function parameters were decimal values. But now, the parameters can also be expression.

For ex,

Round( 1  * (1+  1 /100) % (2 -1), 0)

Function-name : Round
Parameter1    : 1  * (1+  1 /100) % (2 -1)
Parameter2    : 0

Previous Regex:

string pattern2 = @"([a-zA-Z]{1,})[[:blank:]]{0,}\(([^\(\)]{0,})\)";

This regex does not help me anymore to find expression-parameters.

Can someone help me with the right regex to extract function-name & parameters? I am implement all or most of the functions supported by Math class. The program is built in c#

Thanks in advance for the help.

Answer 1

 "^\s*(\w+)\s*\((.*)\)"

group(1) is function name

split group(2) with "," you get para list.

updated

since I don't have Windows system (.Net either), I test it with python. nested function is not a problem. if we add "^\s*" at the beginning of the expression:

import re

s="Round(floor(1300 + 0.234 - 1.765), 1)"
m=re.match("^\s*(\w+)\s*\((.*)\)",s)
m.group(1)
Output: 'Round'

m.group(2)
Output: 'floor(1300 + 0.234 - 1.765), 1'
you can split if you like:
m.group(2).split(',')[0]
Out: 'floor(1300 + 0.234 - 1.765)'

m.group(2).split(',')[1]                                                                                                        
Out: ' 1'

well, if your function nesting is like f(a(b,c(x,y)),foo, m(j,k(n,o(i,u))) ), my code won't work.