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]; |
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]); } |
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]);} |
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];} |
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];} |
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; }} |
