常用的正则表达式
2016-07-27 17:38
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转载:http://www.open-open.com/lib/view/open1390612242398.html
在 iOS 中,我们使用 NSPredicate 的字符串比较功能来进行正则表达式处理,其比较关键字为:MATCHES下面是一些常用的正则表达式 //邮箱 + (BOOL) validateEmail:(NSString *)email { NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; return [emailTest evaluateWithObject:email]; } //手机号码验证 + (BOOL) validateMobile:(NSString *)mobile { //手机号以13, 15,18开头,八个 \d 数字字符 NSString *phoneRegex = @"^((13[0-9])|(15[^4,\\D])|(18[0,0-9]))\\d{8}$"; NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",phoneRegex]; return [phoneTest evaluateWithObject:mobile]; } //车牌号验证 + (BOOL) validateCarNo:(NSString *)carNo { NSString *carRegex = @"^[\u4e00-\u9fa5]{1}[a-zA-Z]{1}[a-zA-Z_0-9]{4}[a-zA-Z_0-9_\u4e00-\u9fa5]$"; NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",carRegex]; NSLog(@"carTest is %@",carTest); return [carTest evaluateWithObject:carNo]; } //车型 + (BOOL) validateCarType:(NSString *)CarType { NSString *CarTypeRegex = @"^[\u4E00-\u9FFF]+$"; NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",CarTypeRegex]; return [carTest evaluateWithObject:CarType]; } //用户名 + (BOOL) validateUserName:(NSString *)name { NSString *userNameRegex = @"^[A-Za-z0-9]{6,20}+$"; NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex]; BOOL B = [userNamePredicate evaluateWithObject:name]; return B; } //密码 + (BOOL) validatePassword:(NSString *)passWord { NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$"; NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex]; return [passWordPredicate evaluateWithObject:passWord]; } //昵称 + (BOOL) validateNickname:(NSString *)nickname { NSString *nicknameRegex = @"^[\u4e00-\u9fa5]{4,8}$"; NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",nicknameRegex]; return [passWordPredicate evaluateWithObject:nickname]; } //身份证号 + (BOOL) validateIdentityCard: (NSString *)identityCard { BOOL flag; if (identityCard.length <= 0) { flag = NO; return flag; } NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$"; NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2]; return [identityCardPredicate evaluateWithObject:identityCard]; }
其实iOS中有三种方式来实现正则表达式的匹配。现在将他们都记录在这里:
1.利用NSPredicate(谓词)匹配
例如匹配有效邮箱:
NSString *email = @“nijino_saki@163.com”;
NSString *regex = @”[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}”;
NSPredicate *predicate = [NSPredicate predicateWithFormat:@”SELF MATCHES %@”, regex];
BOOL isValid = [predicate evaluateWithObject:email];
谓词匹配比较灵活,但是需要有谓词的相关知识。
2.利用rangeOfString:option:直接查找
NSString *searchText = @”// Do any additional setup after loading the view, typically from a nib.”;
NSRange range = [searchText rangeOfString:@”(?:[^,])*\.” options:NSRegularExpressionSearch];
if (range.location != NSNotFound) {
NSLog(@”%@”, [searchText substringWithRange:range]);
}
options中设定NSRegularExpressionSearch就是表示利用正则表达式匹配,会返回第一个匹配结果的位置。
3.使用正则表达式类
NSString *searchText = @”// Do any additional setup after loading the view, typically from a nib.”;
NSError *error = NULL;
NSRegularExpression regex = [NSRegularExpression regularExpressionWithPattern:@”(?:[^,])\.” options:NSRegularExpressionCaseInsensitive error:&error];
NSTextCheckingResult *result = [regex firstMatchInString:searchText options:0 range:NSMakeRange(0, [searchText length])];
if (result) {
NSLog(@”%@\n”, [searchText substringWithRange:result.range]);
}
使用系统的正则表达式类(NSRegularExpression)会返回匹配的多个结果。
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