Extract Japanese Era name only after Mac OS X 10.8/iOS6

extract_era_name.m

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        NSCalendar *japanese = [[NSCalendar alloc] initWithCalendarIdentifier:NSJapaneseCalendar];
        NSLocale *aLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
        NSDateFormatter *aFormatter = [[NSDateFormatter alloc] init];
        aFormatter.calendar = japanese;
        aFormatter.locale = aLocale;
        aFormatter.dateFormat = @"G";

        NSDateComponents *comps = [[NSDateComponents alloc] init];
        comps.era = 231; // 0-235
        comps.year = 1;
        comps.month = 12;
        comps.day = 31;
        NSDate *aDate = [japanese dateFromComponents:comps];
        NSString *aString = [aFormatter stringFromDate:aDate];
        NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"^(.*)\\b.\\(.*\\)"
                                                                               options:0
                                                                                 error:NULL];
        aString = [regex stringByReplacingMatchesInString:aString
                                                  options:0
                                                    range:NSMakeRange(0, [aString length])
                                             withTemplate:@"$1"];
        
        NSLog(@"[%@]",aString);
    }
    return 0;
}