如何检查字符串中是否只包含目标C中的字母数字字符？ [英] How to check if a string only contains alphanumeric characters in objective C?

问题描述

我正在开发一个小型iphone项目，我需要检查输入的userName是否只包含字母数字字符？ （AZ，az，0-9 。我将如何检查？

I'm working on a small iphone project and i would need to check if the userName entered only contains alphanumerical characters? (A-Z, a-z, 0-9. How would i go about checking it?

推荐答案

如果您不想为这一项任务引入正则表达式库...

If you don't want to bring in a regex library for this one task...

NSString *str = @"aA09";
NSCharacterSet *alphaSet = [NSCharacterSet alphanumericCharacterSet];
BOOL valid = [[str stringByTrimmingCharactersInSet:alphaSet] isEqualToString:@""]; 

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