Regex for variable declaration and initialization in c#

Question

I want to write a RegEx to pull out all the variable values and their names from the variable declaration statement. Say i have

int i,k = 10,l=0

i want to wr

Answer 1

Here is some useful information which you can use

http://compsci.ca/v3/viewtopic.php?t=6712

Answer 2

Start thinking about the structure of a definition, say,

(a line can start with some spaces) followed by,

(Type) followed by

(at least one space)
(variable_1)
(optionally
   (comma // next var
    |
    '='number // initialization
    ) ...`

then try to convert each group:

^      \s*    \w+           \s+        \w+         ?          (','    |  '=' \d+   ) ...
line  some    type          at least  var          optionally   more  or init some
start spaces  (some chars)  one space (some chars)              vars     val  digits

Left as homework to remove spaces and fix up the final regex.

Answer 3

Try this:

 ^(int|[sS]tring)\s+\w+\s*(=\s*[^,]+)?(,\s*\w+\s*(=\s*[^,]+)?)*$

It'll match your example code

int i,k = 10,l=0

And making a few assumptions about the language you may or may not be using, it'll also match:

int i, j, k=10, l=0
string i=23, j, k=10, l=0

Answer 4

You could build up your regular expression from the [C# Grammar](http://msdn.microsoft.com/en-us/library/aa664812(VS.71).aspx). But building a parser would certainly be better.