IOS开发中正则表达式创建过程

+ (nullable NSRegularExpression *)regularExpressionWithPattern:(NSString *)pattern options:(NSRegularExpressionOptions)options error:(NSError **)error;

- (nullable instancetype)initWithPattern:(NSString *)pattern options:(NSRegularExpressionOptions)options error:(NSError **)error

 typedef NS_OPTIONS(NSUInteger, NSRegularExpressionOptions) {
 NSRegularExpressionCaseInsensitive  = 1 

//枚举允许Block处理每个正则表达式匹配的字符串
- (void)enumerateMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range usingBlock:(void (NS_NOESCAPE ^)(NSTextCheckingResult * _Nullable result, NSMatchingFlags flags, BOOL *stop))block;

//返回一个数组，包含字符串中正则表达式的所有匹配项
- (NSArray *)matchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;

//返回字符串指定范围内匹配数
- (NSUInteger)numberOfMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;

//返回字符串指定范围内第一个匹配项。
- (nullable NSTextCheckingResult *)firstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;

//返回字符串指定范围内第一个匹配的范围
- (NSRange)rangeOfFirstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;

typedef NS_OPTIONS(NSUInteger, NSMatchingOptions) {
 NSMatchingReportProgress   = 1 

//返回与模板字符串替换的匹配正则表达式的新字符串
- (NSString *)stringByReplacingMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range withTemplate:(NSString *)templ;

//返回替换的个数
- (NSUInteger)replaceMatchesInString:(NSMutableString *)string options:(NSMatchingOptions)options range:(NSRange)range withTemplate:(NSString *)templ;

//自定义替换功能
- (NSString *)replacementStringForResult:(NSTextCheckingResult *)result inString:(NSString *)string offset:(NSInteger)offset template:(NSString *)templ;

//通过根据需要添加反斜杠转义来返回模板字符串，以保护符合模式元字符的任何字符
+ (NSString *)escapedTemplateForString:(NSString *)string;

 NSString *str = @"aabbcccdeaargdo14141214aaghfh56821d3gad4";
 NSRegularExpression *expression = [NSRegularExpression regularExpressionWithPattern:@"aa" options:NSRegularExpressionCaseInsensitive error:NULL];
 if (expression != nil) {
  //匹配到的第一组
  NSTextCheckingResult *firstMatch = [expression firstMatchInString:str options:NSMatchingReportProgress range:NSMakeRange(0, str.length)];
  NSRange range = [firstMatch rangeAtIndex:0];
  NSString *result = [str substringWithRange:range];
  NSLog(@"匹配到的第一组:%@",result);
  //匹配到的个数
  NSInteger number = [expression numberOfMatchesInString:str options:NSMatchingReportProgress range:NSMakeRange(0, str.length)];
  NSLog(@"匹配到的个数%ld",number);
  //配到到的所有数据
  NSArray *allMatch = [expression matchesInString:str options:NSMatchingReportProgress range:NSMakeRange(0, str.length)];
  for (int i = 0; i 

//NSStringCompareOptions --> NSRegularExpressionSearch
- (NSRange)rangeOfString:(NSString *)searchString options:(NSStringCompareOptions)mask;
- (NSRange)rangeOfString:(NSString *)searchString options:(NSStringCompareOptions)mask range:(NSRange)rangeOfReceiverToSearch;
- (NSRange)rangeOfString:(NSString *)searchString options:(NSStringCompareOptions)mask range:(NSRange)rangeOfReceiverToSearch locale:(nullable NSLocale *)locale

 NSString *str = @"aabbcccdeaargdo14141214aaghfh56821d3gad4";
 NSRange strMatchStr = [str rangeOfString:@"aa" options:NSRegularExpressionSearch];
 NSLog(@"匹配到字符串的位置:开始位置%lu--长度%lu",(unsigned long)strMatchStr.location,(unsigned long)strMatchStr.length)
打印log:
NSRegularExpressionDemo[82080:8224265] 匹配到字符串的位置:开始位置0--长度2

 NSString *str2 = @"aabbcc";
 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",@"^aa(.)*cc$"];
 BOOL isMatch = [predicate evaluateWithObject:str2];
 NSLog(@"匹配的结果:%d",isMatch);
打印log:
NSRegularExpressionDemo[82679:8253019] 匹配的结果:1