Very Stupid Regex question

[seany via Digitalmars-d-learn]

Cosider please the following:

string s1 = PREabcdPOST;
string s2 = PREabPOST;


string[] srar = ["ab", "abcd"];
// this can not be constructed with a particular order

foreach(sr; srar)
{

   auto r = regex(sr; "g");
   auto m = matchFirst(s1, r);
   break;
   // this one matches ab
   // but I want this to match abcd
   // and for s2 I want to match ab

}

obviously there are ways like counting the match length, and then 
using the maximum length, instead of breaking as soon as a match 
is found.

Are there any other better ways?