NSRegularExpression iOS自带的正则表达式

以前做验证邮箱,电话号码的时候通常用第三方的正则表达式或者NSPredicate(点这里查看以前的文章),在后期,苹果推出了自己的正则表达式来提供给开发者调用,很方便,功能也强大.

      具体可以查看官方文档,包括如何书写进行匹配的正则表达式例子,这里我就不多加详述了,因为本人看那一堆符号好烦.....只好直接求助于谷歌了,下面只给出几个常用的.

    #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. 返回所有匹配结果的集合(适合,从一段字符串中提取我们想要匹配的所有数据)
         *  - (NSArray *)matchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
         2. 返回正确匹配的个数(通过等于0,来验证邮箱,电话什么的,代替NSPredicate)
         *  - (NSUInteger)numberOfMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
         3. 返回第一个匹配的结果。注意，匹配的结果保存在  NSTextCheckingResult 类型中
         *  - (NSTextCheckingResult *)firstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;
         4. 返回第一个正确匹配结果字符串的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,   // 不区分大小写的
         NSRegularExpressionAllowCommentsAndWhitespace  = 1 << 1,   // 忽略空格和# -
         NSRegularExpressionIgnoreMetacharacters        = 1 << 2,   // 整体化
         NSRegularExpressionDotMatchesLineSeparators    = 1 << 3,   // 匹配任何字符，包括行分隔符
         NSRegularExpressionAnchorsMatchLines           = 1 << 4,   // 允许^和$在匹配的开始和结束行
         NSRegularExpressionUseUnixLineSeparators       = 1 << 5,   // (查找范围为整个的话无效)
         NSRegularExpressionUseUnicodeWordBoundaries    = 1 << 6    // (查找范围为整个的话无效)
         };
         typedef NSUInteger NSRegularExpressionOptions;
         */

        // 下面2个枚举貌似都没什么意义,除了在block方法中,一般情况下,直接给0吧
        /**
         *  enum {
         NSMatchingReportProgress         = 1 << 0,
         NSMatchingReportCompletion       = 1 << 1,
         NSMatchingAnchored               = 1 << 2,
         NSMatchingWithTransparentBounds  = 1 << 3,
         NSMatchingWithoutAnchoringBounds = 1 << 4
         };
         typedef NSUInteger NSMatchingOptions;
         */

        /** 此枚举值只在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;
         */

        // 测试字符串，把里面的电话号码解析出来
        NSString *urlString = @"哈哈哈哈呵呵呵s15279107723在这里啊啊啊啊s15279107716";
        NSError *error = NULL;
        // 根据匹配条件,创建了一个正则表达式(类方法,实例方法类似)
        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];
                //从urlString中截取数据
                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.....(坑爹的返回第一个匹配结果)
            [regex enumerateMatchesInString:urlString options:0 range:NSMakeRange(0, [urlString length]) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *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;
            }];
        }

        // 替换掉你要匹配的字符串
        NSString *reString = [regex stringByReplacingMatchesInString:urlString
                                                            options:0
                                                            range:NSMakeRange(0, [urlString length])
                                                            withTemplate:@"(我就是替换的值)"];
        NSLog(@"reString = %@",reString);
        // 还有2个方法大家可以去尝试看看

        // 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对象
        if(match.count != 0)
        {
            for (NSTextCheckingResult *matc in match)
            {
                NSRange range = [matc range];
                NSValue *value = [NSValue valueWithRange:range];
                [rangeArr addObject:value];
            }
        }
        // 将要匹配的值取出来,存入数组当中
        __block NSMutableArray *mulArr = [NSMutableArray array];
        [rangeArr enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
            NSValue *value = (NSValue *)obj;
            NSRange range = [value rangeValue];
            [mulArr addObject:[str substringWithRange:range]];
        }];
        return mulArr;
    }

@结果: