Objective-C使用正则表达式进行匹配 iOS App开发中Objective-C使用正则表达式进行匹配的方法
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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。
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; } }
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