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：
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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];
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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
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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]);
}
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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
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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]);
}
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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
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+ (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];
}
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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
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+ (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];
}
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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
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//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;
}
}
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