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[mnemonic_fx]

This might works for you.

NSRange range = [theString rangeOfString:@">"];

NSString *coordinate = [theString substringWithRange:NSMakeRange(1, range.location-1)];

NSArray *coordinateValues = [coordinate componentsSeparatedByString:@","];

NSString *xValue = [coordinateValues objectAtIndex:0];
NSString *yValue = [coordinateValues objectAtIndex:1];