正则表达式 使用代码
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, 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, BOOLBOOL *stop) {
- NSValue *value = (NSValue *)obj;
- NSRange range = [value rangeValue];
- [mulArr addObject:[str substringWithRange:range]];
- }];
- return mulArr;
- }
@结果: