CPRegularExpression is a wrapper around the POSIX regex.h library.
Example code
NSString* test = [NSString stringWithContentsOfFile:@"TestFile.txt"];
NSRange curRange = NSMakeRange(0, [test length]);
CPRegularExpression* re = [CPRegularExpression regularExpressionWithString:@"([-_[:alpha:]]+)=['\"]?([^'\">[:blank:]]*)['\"]?"];
NSUInteger subexprCount = [re numberOfSubexpressions];
NSRange subexprs[subexprCount];
while (1) {
NSRange newRange = [re matchedRangeForString:test range:curRange subexpressionRanges:subexprs count:subexprCount];
if (newRange.location == NSNotFound) {
break;
} else {
NSLog(@"%@ -> %@", [test substringWithRange:subexprs[0]], [test substringWithRange:subexprs[1]]);
// Changing the range alone is buggy.
test = [test substringFromIndex:newRange.location + newRange.length];
curRange.length = [test length];
}
}