Objective-C中利用正则去除非数字字母汉字方法实例

@interface ViewController ()@property (weak, nonatomic) IBOutlet UITextField *input;@property (weak, nonatomic) IBOutlet UILabel *label;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; self.input.delegate = self; [self.input addTarget:self action:@selector(textChange:) forControlEvents:UIControlEventEditingChanged];}//当文本内容改变时调用- (void)textChange:(UITextField *)textField{ //这里调用相关方法过滤字符串显示出来 self.label.text = //...;}

- (NSString *)filterString1:(NSString *)str { NSString *regex = @"^[a-zA-Z0-9/u4e00-/u9fa5]+"; NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex]; NSMutableString * retStr = [NSMutableString string]; for(NSInteger i=0; i< [str length];i++){  NSRange range = NSMakeRange(i, 1);  NSString *character = [str substringWithRange:range];  if([pred evaluateWithObject:character])  {   [retStr appendString:character];  } } return retStr;}

//方案2- (NSString *)filterString2:(NSString *)str { NSString *regex = @"[^a-zA-Z0-9/u4e00-/u9fa5]"; NSMutableString *mstr = [NSMutableString stringWithFormat:@"%@", str]; NSUInteger i = [mstr replaceOccurrencesOfString:regex withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, mstr.length)]; return [NSString stringWithFormat:@"%@-长度:%zd",mstr,i];}

//方案3- (NSString *)filterString3:(NSString *)str { NSString *regex = @"[^a-zA-Z0-9/u4e00-/u9fa5]"; return [str stringByReplacingOccurrencesOfString:regex withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, str.length)];}