[Regexkit-discussion] Regex string results in an infinite loop

[Aaron W. <pap...@gm...>]

Hello,

The following code block results in an infinite loop. The subject  
string that is commented out, seems to work ok. I'have tried the same  
expression on other engines without this problem. I should note that  
this expression comes from the textmate c code bundle. Am I missing  
anything here?

{
		// capture preprocessor macro
		NSString *regexString = @"(?ms)((?x)^\\s*\\#\\s*(define)\\s+((?<id> 
[a-zA-Z_][a-zA-Z0-9_]*))(?:(\\()(\\s*\\g{id}\\s*((,)\\s*\\g{id}\\s*)* 
(?:\\.\\.\\.)?)(\\)))?.*?(?=(?://|/\\*))|$)";
	NSString *subjectString = @"/";
	// NSString *subjectString = @"#define HELLO(a,b) hello(a,b) // say  
hello";
	NSUInteger matchCount = 0;
	
	// make sure regexString doesn't cause an infinate loop
	RKEnumerator *matchEnumerator = [subjectString  
matchEnumeratorWithRegex:regexString];	
	while([matchEnumerator nextRanges] != NULL) {
		matchCount++;
		if(matchCount++ > 10) {
			assert(0);
	}
}



thanks,
kube