RegEx Split function dies.

From: tfandango (tfandango_at_[hidden])
Date: 2003-05-06 16:18:40

Hi- 
 
I am attempting to parse email headers using the boost regex library.
 I would 
prefer that each email address in the TO field (delimited by a comma)
would be 
placed into a vector<string>. 
 
Currently, I am able to obtain the entire to line (all the to
addresses).  I can use 
another regular expression to seperate it out but I'd rather do it
all in one.  However, 
If I try to add another more to this I get an exception: 
 
"Max regex search depth exceeded." 
 
I am assuming that this is because I've created a infinite loop.  I'm
not sure how to 
extend this expression to place every email address in the vector
seperatly. 
 
Thanks 
 
 
here's my code snippet: 
 
        char * expression_text =  
                //Any possible leading whitespace: 
                "^[ ]*" 
                //The "To" field name in any case: 
                "TO" 
                //Any more whitespace: 
                "[ ]*" 
                //Then a colon: 
                ":" 
                //More white space potentially 
                "[ ]*" 
                //Everything here is an address up to "\r\n"; 
                "([-@_\\.\"<>A-Za-z0-9]+),?"; 
         
        //Create the expression class to use: 
        RegEx expression(expression_text, true); 
 
        //Attempt to grep the mail_buffer: 
        int num_recv = 0; 
        try { 
                num_recv = expression.Split(to, mail_buffer); 
        } 
        catch (...){ 
                //throw some exception 
        } 
}