iOS中有关正则表达式的使用

//身份证号码验证

#pragma 正则匹配用户身份证号15或18位
-(BOOL)checkUserIdCard: (NSString *) idCard
{
NSString *pattern = @"(^[0-9]{15}$)|([0-9]{17}([0-9]|X)$)";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:idCard];
return isMatch;
}
#pragma 正则匹配手机号
+ (BOOL)checkTelNumber:(NSString *) telNumber
{
NSString *pattern = @"^1+[3578]+\\d{9}";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:telNumber];
return isMatch;
}

#pragma 正则匹配用户密码6-18位数字和字母组合
+ (BOOL)checkPassword:(NSString *) password
{
NSString *pattern = @"^(?![0-9]+$)(?![a-zA-Z]+$)[a-zA-Z0-9]{6,18}";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:password];
return isMatch;
}

#pragma 正则匹配用户姓名,20位的中文或英文

+ (BOOL)checkUserName : (NSString *) userName
{
NSString *pattern = @"^[a-zA-Z一-龥]{1,20}";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:userName];
return isMatch;

}

#pragma 正则匹员工号,12位的数字

+ (BOOL)checkEmployeeNumber : (NSString *) number
{
NSString *pattern = @"^[0-9]{12}";

NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:number];
return isMatch;

}

#pragma 正则匹配URL

+ (BOOL)checkURL : (NSString *) url
{
NSString *pattern = @"^[0-9A-Za-z]{1,50}";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
BOOL isMatch = [pred evaluateWithObject:url];
return isMatch;

}

判断字符串是否是数字:
NSString
*pattern =
@"^[0-9]*$";

NSPredicate *pred = [NSPredicate
predicateWithFormat:@"SELF MATCHES %@",
pattern];

BOOL isMatch = [pred
evaluateWithObject:str];

return isMatch;