Question

I would like to be able to take the numbers lying behind the ` symbol and in front of any character that is non-numerical and convert it into a integer.

Ex.

Original String: 2*3*(123`)
Result:          123

Original String: 4`12
Result:          4

Thanks,
Regards.

Answer 1

You can use regular expressions. You can find all the occurrences like this:

NSString *mystring = @"123(12`)456+1093`";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"([0-9]+)`" options:0 error:nil];
NSArray *matches = [regex matchesInString:mystring options:0 range:NSMakeRange(0, mystring.length)];
for (NSTextCheckingResult *match in matches) {
    NSLog(@"%@", [mystring substringWithRange:[match rangeAtIndex:1]]);
}
    // 12 and 1093

If you only need one occurrence, then replace the for loop with the following:

if (matches.count>0) {
    NSTextCheckingResult *match = [matches objectAtIndex:0];
    NSLog(@"%@", [mystring substringWithRange:[match rangeAtIndex:1]]);
}