화면 처리는 무조건 메인스레드를 이용하라! (특히 UIProgressView를 쓸때 많이 사용한다.)
[self performSelectorOnMailThread:@selector(aaa) withObject:nil waitUntilDone:YES];
< Regular Expressions in Objective-C >
NSString *str = @"1234abcd";
NSString *ptn = @"[a-z]";
NSRange range = [str rangeOfString:ptn options:NSRegularExpressionSearch];
[출처 : http://cafe.naver.com/mcbugi/70323]
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