Escaping a pattern doesn't do what you want

main.m

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        NSString *patternFromFile = @"/path/to/(something|theotherthing)";
        NSRegularExpression *regex1 = [NSRegularExpression regularExpressionWithPattern:patternFromFile options:NSRegularExpressionCaseInsensitive error:nil];
        NSRegularExpression *regex2 = [NSRegularExpression regularExpressionWithPattern:[NSRegularExpression escapedPatternForString:patternFromFile] options:NSRegularExpressionCaseInsensitive error:nil];
        NSString *string = @"/path/to/something";
        for (NSRegularExpression *regex in @[regex1, regex2]) {
            NSLog(@"matches: %ld", [regex numberOfMatchesInString:string options:0 range:NSMakeRange(0, string.length)]);
        }
    }
    return 0;
}