NSRegularExpression 使用小記

 

一些NSRegularExpression方法的使用

 //block方式遍歷出合適的結果
 - (void)enumerateMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range usingBlock:(void (NS_NOESCAPE ^)(NSTextCheckingResult * _Nullable result, NSMatchingFlags flags, BOOL *stop))block;
 
 //返回所有匹配的結果
 - (NSArray<NSTextCheckingResult *> *)matchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
 
 //返回匹配個數
 - (NSUInteger)numberOfMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
 
  返回第一個匹配的結果,結果保存在 NSTextCheckingResult
 - (nullable NSTextCheckingResult *)firstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
 
   返回第一個正確匹配結果字符串的NSRange
 - (NSRange)rangeOfFirstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;

測試例子：

    NSString *p1 = @"L[A-C]";//匹配LA LB LC
    NSString *s1 = @"w29LBjswLCnkow";

    [self validateString:s1 withPattern:p1];

- (BOOL)validateString:(NSString *)string withPattern:(NSString *)pattern{

    NSError *error = NULL;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];
    
    NSRange textRange = NSMakeRange(0, string.length);
    
    //1.返回第一個正確匹配結果字符串的NSRange
    NSRange matchRange = [regex rangeOfFirstMatchInString:string options:NSMatchingReportProgress range:textRange];
    NSLog(@"%@",NSStringFromRange(matchRange));//{3, 2}
    
    //2.返回第一個匹配的結果,結果保存在 NSTextCheckingResult
    NSTextCheckingResult *textCheck = [regex firstMatchInString:string options:NSMatchingReportProgress range:textRange];
     NSLog(@"%@",NSStringFromRange(textCheck.range));//{3, 2}
    
    //3.返回匹配個數
    NSUInteger number = [regex numberOfMatchesInString:string options:NSMatchingReportProgress range:textRange];
    NSLog(@"%lu",(unsigned long)number);//2
    
    //4.返回所有匹配的結果
    NSArray<NSTextCheckingResult *> *results = [regex matchesInString:string options:NSMatchingReportProgress range:textRange];
    NSLog(@"%@",results);
    //"<NSSimpleRegularExpressionCheckingResult: 0x60800007c580>{3, 2}{<NSRegularExpression: 0x60000004e6a0> L[A-C] 0x1}",
    //"<NSSimpleRegularExpressionCheckingResult: 0x60800007c040>{8, 2}{<NSRegularExpression: 0x60000004e6a0> L[A-C] 0x1}"
    
    //5.
    [regex enumerateMatchesInString:string options:0 range:textRange usingBlock:^(NSTextCheckingResult * _Nullable result, NSMatchingFlags flags, BOOL * _Nonnull stop) {
        NSLog(@"%@",result);
    }];
    //"<NSSimpleRegularExpressionCheckingResult: 0x60800007c580>{3, 2}{<NSRegularExpression: 0x60000004e6a0> L[A-C] 0x1}",
    //"<NSSimpleRegularExpressionCheckingResult: 0x60800007c040>{8, 2}{<NSRegularExpression: 0x60000004e6a0> L[A-C] 0x1}"
    
    //6.替換匹配的值
    NSString *newString = [regex stringByReplacingMatchesInString:string options:0 range:textRange withTemplate:@"Replace-100"];
    NSLog(@"new str:%@",newString);//new str:w29Replace-100jswReplace-100nkow
    
    BOOL didValidate = NO;
    if (matchRange.location != NSNotFound)
        didValidate = YES;
    
    return didValidate;

}