正則表達式 使用代碼

以前做驗證郵箱,電話號碼的時候通常用第三方的正則表達式或者NSPredicate(點這里查看以前的文章),在后期,蘋果推出了自己的正則表達式來提供給開發者調用,很方便,功能也強大.

      具體可以查看官方文檔,包括如何書寫進行匹配的正則表達式例子,這里我就不多加詳述了,因為本人看那一堆符號好煩.....只好直接求助於谷歌了,下面只給出幾個常用的.

 

#define KPhoneRegex  @"\\d{3}-\\d{8}|\\d{3}-\\d{7}|\\d{4}-\\d{8}|\\d{4}-\\d{7}|1+[358]+\\d{9}|\\d{8}|\\d{7}"
#define KWebRegex    @"((http[s]{0,1}|ftp)://[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)|(www.[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4})(:\\d+)?(/[a-zA-Z0-9\\.\\-~!@#$%^&*+?:_/=<>]*)?)"
#define KWebOtherRegex @"http+:[^\\s]*"
#define KEmailRegex  @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"

 

/**
     1. 返回所有匹配結果的集合(適合,從一段字符串中提取我們想要匹配的所有數據)
     *  - (NSArray *)matchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
     2. 返回正確匹配的個數(通過等於0,來驗證郵箱,電話什么的,代替NSPredicate)
     *  - (NSUInteger)numberOfMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
     3. 返回第一個匹配的結果。注意，匹配的結果保存在  NSTextCheckingResult 類型中
     *  - (NSTextCheckingResult *)firstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
     4. 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;
     5. block方法
     *  - (void)enumerateMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range usingBlock:(void (^)(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop))block;
     */

    /**
     *  enum {
     NSRegularExpressionCaseInsensitive             = 1 << 0,   // 不區分大小寫的
     NSRegularExpressionAllowCommentsAndWhitespace  = 1 << 1,   // 忽略空格和# -
     NSRegularExpressionIgnoreMetacharacters        = 1 << 2,   // 整體化
     NSRegularExpressionDotMatchesLineSeparators    = 1 << 3,   // 匹配任何字符，包括行分隔符
     NSRegularExpressionAnchorsMatchLines           = 1 << 4,   // 允許^和$在匹配的開始和結束行
     NSRegularExpressionUseUnixLineSeparators       = 1 << 5,   // (查找范圍為整個的話無效)
     NSRegularExpressionUseUnicodeWordBoundaries    = 1 << 6    // (查找范圍為整個的話無效)
     };
     typedef NSUInteger NSRegularExpressionOptions;
     */

    // 下面2個枚舉貌似都沒什么意義,除了在block方法中,一般情況下,直接給0吧
    /**
     *  enum {
     NSMatchingReportProgress         = 1 << 0,
     NSMatchingReportCompletion       = 1 << 1,
     NSMatchingAnchored               = 1 << 2,
     NSMatchingWithTransparentBounds  = 1 << 3,
     NSMatchingWithoutAnchoringBounds = 1 << 4
     };
     typedef NSUInteger NSMatchingOptions;
     */

    /** 此枚舉值只在5.block方法中用到
     *  enum {
     NSMatchingProgress               = 1 << 0,
     NSMatchingCompleted              = 1 << 1,
     NSMatchingHitEnd                 = 1 << 2,
     NSMatchingRequiredEnd            = 1 << 3,
     NSMatchingInternalError          = 1 << 4
     };
     typedef NSUInteger NSMatchingFlags;
     */


    // 測試字符串，把里面的電話號碼解析出來
    NSString *urlString = @"哈哈哈哈呵呵呵s15279107723在這里啊啊啊啊s15279107716";
    NSError *error = NULL;
    // 根據匹配條件,創建了一個正則表達式(類方法,實例方法類似)
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:KPhoneRegex options:NSRegularExpressionCaseInsensitive error:&error];
    if (regex != nil) {
        // 3.....
        NSTextCheckingResult *firstMatch = [regex firstMatchInString:urlString
                                                             options:0
                                                            range:NSMakeRange(0, [urlString length])];
        if (firstMatch) {
            NSRange resultRange = [firstMatch rangeAtIndex:0];
            //從urlString中截取數據
            NSString *result = [urlString substringWithRange:resultRange];
            NSLog(@"result = %@",result);
        }
        // 2.....
        NSUInteger number = [regex numberOfMatchesInString:urlString
                                                   options:0
                                                   range:NSMakeRange(0, [urlString length])];
        NSLog(@"number = %ld",number);
        // 5.....(坑爹的返回第一個匹配結果)
        [regex enumerateMatchesInString:urlString options:0 range:NSMakeRange(0, [urlString length]) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOLBOOL *stop) {
            NSLog(@"---%@",NSStringFromRange([result range]));
            if (flags != NSMatchingInternalError) {
                NSRange firstHalfRange = [result rangeAtIndex:0];
                if (firstHalfRange.length > 0) {
                    NSString *resultString1 = [urlString substringWithRange:firstHalfRange];
                    NSLog(@"result1 = %@",resultString1);
                }
            }
            *stop = YES;
        }];
    }

    // 替換掉你要匹配的字符串
    NSString *reString = [regex stringByReplacingMatchesInString:urlString
                                                        options:0
                                                        range:NSMakeRange(0, [urlString length])
                                                        withTemplate:@"(我就是替換的值)"];
    NSLog(@"reString = %@",reString);
    // 還有2個方法大家可以去嘗試看看


    // 1.
    NSMutableArray *oneArray = [self _matchLinkWithStr:urlString withMatchStr:KPhoneRegex];
    for (NSString *phone in oneArray) {
        NSLog(@"phone = %@",phone);
    }

 

// 1.....
- (NSMutableArray *)_matchLinkWithStr:(NSString *)str withMatchStr:(NSString *)matchRegex;
{
    NSError *error = NULL;
    NSRegularExpression *reg = [NSRegularExpression regularExpressionWithPattern:matchRegex
                                                                         options:NSRegularExpressionCaseInsensitive
                                                                           error:&error];
    NSArray *match = [reg matchesInString:str
                                  options:NSMatchingReportCompletion
                                  range:NSMakeRange(0, [str length])];

    NSMutableArray *rangeArr = [NSMutableArray array];
    // 取得所有的NSRange對象
    if(match.count != 0)
    {
        for (NSTextCheckingResult *matc in match)
        {
            NSRange range = [matc range];
            NSValue *value = [NSValue valueWithRange:range];
            [rangeArr addObject:value];
        }
    }
    // 將要匹配的值取出來,存入數組當中
    __block NSMutableArray *mulArr = [NSMutableArray array];
    [rangeArr enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOLBOOL *stop) {
        NSValue *value = (NSValue *)obj;
        NSRange range = [value rangeValue];
        [mulArr addObject:[str substringWithRange:range]];
    }];
    return mulArr;
}

    @結果: