NSString * reg = @"[0-9]+";//字符串正則表達(dá)式NSError *error = NULL;//錯誤對象NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:reg options:NSRegularExpressionCaseInsensitive error:&error];//匹配reg的正則表達(dá)式對象 

/**1 * 正則表達(dá)式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內(nèi)匹配 * @param block 在block內(nèi)會把匹配到的結(jié)果逐個(gè)返回NSTextCheckingResult，通過此對象的range屬性可以查看匹配到的字符串的location和length，同過subString方法可以得到被匹配字符串 */- (void)enumerateMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range usingBlock:(void (^)(NSTextCheckingResult * __nullable result, NSMatchingFlags flags, BOOL *stop))block; /**2 * 正則表達(dá)式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內(nèi)匹配 * @param block 返回?cái)?shù)組，數(shù)組內(nèi)是每個(gè)匹配到的NSTextCheckingResult */- (NSArray<NSTextCheckingResult *> *)matchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range; /**3 * 正則表達(dá)式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內(nèi)匹配 * @param block 返回匹配到的個(gè)數(shù) */- (NSUInteger)numberOfMatchesInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range; /**4 * 正則表達(dá)式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內(nèi)匹配 * @param block 返回第一次匹配到的NSTextCheckingResult對象 */- (nullable NSTextCheckingResult *)firstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range; /**5 * 正則表達(dá)式匹配 * * @param string 在此字符串中匹配 * @param options 一般填0 * @param range 在此范圍內(nèi)匹配 * @param block 返回第一次匹配到的NSTextCheckingResult對象的range */- (NSRange)rangeOfFirstMatchInString:(NSString *)string options:(NSMatchingOptions)options range:(NSRange)range;3.NSString //- (NSRange)rangeOfString:(NSString *)searchString options:(NSStringCompareOptions)mask;//- (NSRange)rangeOfString:(NSString *)searchString options:(NSStringCompareOptions)mask range:(NSRange)searchRange;//匹配文本-(void)matchIn{ NSString *searchText = @"rangeOf77Str88ing"; //只能匹配一次 NSRange range = [searchText rangeOfString:@"[0-9]+" options:NSRegularExpressionSearch]; //拿到匹配結(jié)果 if (range.location != NSNotFound) { NSString * searchString= [searchText substringWithRange:range]; NSLog(@"range.location = %lu range.length = %lu", (unsigned long)range.location,(unsigned long)range.length); NSLog(@"String = %@",searchString); }else{ NSLog(@"沒有匹配"); }} 4、正則表達(dá)式示例代碼 
NSString *summaryString = [NSString stringWithFormat:@"對%@題 錯%@題 | 任務(wù)正確率%@ | 作業(yè)平均正確率%@", questionRight, questionWrong, questionRate, taskRate];
NSMutableAttributedString *summaryAttributString = [[NSMutableAttributedString alloc] initWithString:summaryString];
// 正則匹配,匹配數(shù)字和百分號
NSString *reg = @"[0-9]+|%";
NSError *error = nil;
NSRegularExpression *regex = [[NSRegularExpression alloc] initWithPattern:reg options:NSRegularExpressionCaseInsensitive error:&error];
NSArray *array = [regex matchesInString:summaryString options:0 range:NSMakeRange(0, summaryString.length)];
if (array.count) {
for (int i = 0; i < array.count; i++) {
NSTextCheckingResult *result = array[i];
NSRange range = result.range;
[summaryAttributString addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithHexString:@"#e71419"] range:range];
}
}
self.summaryLabel.attributedText = summaryAttributString;

//驗(yàn)證是否存在-(BOOL)validateRegular:(NSString * )regular matchText:(NSString *)text;{ 
//正則表達(dá)式格式 
//NSString* regular=@"^1[0-9]{6}$"; 
//創(chuàng)建謂詞 
NSPredicate *numberPre = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regular]; 
//匹配字符串，若能匹配返回YES，否則返回NO； 
BOOL isMatch = [numberPre evaluateWithObject:text]; 
return isMatch;}