Oc 正则表达式~详解 03 (实现代码)

**一、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:0range:NSMakeRange(0,
[searchText length])];

if(result)
{

NSLog(@"%@\n",
[searchText substringWithRange:result.range]);

}

二、使用系统的正则表达式类（NSRegularExpression）会返回匹配的多个结果。

实例：

1.验证邮箱

+ (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];

}

NSPredicate是一个Foundation类，是用来查询的，原理和用法都类似于SQL中的where。

2.验证手机号

简单的判断方法

+(BOOL)validatePhone:(NSString *)phone

{

NSString *phoneRegex = @"1[3|5|7|8|][0-9]{9}";

NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", phoneRegex];

return [phoneTest evaluateWithObject:phone];

}

这只是简单地判断手机号格式。其实手机的格式还是有一点复杂的。

详细的判断方法

//正则判断手机号码格式

+(BOOL)validatePhone:(NSString *)phone

{
/**

*
手机号码

*
移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188

*
联通：130,131,132,152,155,156,185,186

*
电信：133,1349,153,180,189

*/

NSString
* MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";

/**

*
中国移动：China Mobile

*
134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188

*/

NSString  * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";

/**

*
中国联通：China Unicom

*
130,131,132,152,155,156,185,186

*/

NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";

/**

*
中国电信：China Telecom

*
133,1349,153,180,189

*/

NSString * CT = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";

/**

*
大陆地区固话及小灵通

*
区号：010,020,021,022,023,024,025,027,028,029

*
号码：七位或八位

*/

//
NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";

NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];

NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];

NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];

NSPredicate  *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];

if
(([regextestmobile evaluateWithObject:phone] == YES)

||
([regextestcm evaluateWithObject:phone] == YES)

||
([regextestct evaluateWithObject:phone] == YES)

||
([regextestcu evaluateWithObject:phone] == YES))

{

if([regextestcm evaluateWithObject:phone] == YES) {

NSLog(@"China Mobile");

}
else if([regextestct evaluateWithObject:phone] == YES) {

NSLog(@"China Telecom");

}
else if ([regextestcu evaluateWithObject:phone] == YES) {

NSLog(@"China Unicom");

}
else {

NSLog(@"Unknow");

}
return YES;

}

else
{

return NO;

}

}