正则表达式处理文档

```

int main(int argc, const char * argv[]) {

@autoreleasepool {

// insert code here...

NSLog(@"Hello, World!");

// 正则 格式

NSRegularExpression * egn = [ NSRegularExpression regularExpressionWithPattern:@".+(?=(http:|https:))" options:NSRegularExpressionCaseInsensitive error:nil ] ;

// 文件位置

NSMutableString * baseStr = [ NSMutableString stringWithContentsOfFile:@"/Users/yghl010/Documents/测试/测试/live_source_2022-02-28.txt" encoding:NSUTF8StringEncoding error:nil ];

// 生成正则表达筛选对象

NSArray * arr_result= [egn matchesInString:baseStr options:0 range: (NSMakeRange(0 , baseStr.length))]; __block NSInteger tempindex = 0 ;

// 处理文字

[arr_result enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(NSTextCheckingResult* _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

NSLog(@"%@", [baseStr substringWithRange: (NSMakeRange(obj.range.location-tempindex , obj.range.length))]) ;

[baseStr replaceOccurrencesOfString:[baseStr substringWithRange: (NSMakeRange(obj.range.location , obj.range.length))] withString:@"" options:NSForcedOrderingSearch range:(NSMakeRange(obj.range.location , obj.range.length))];

//

tempindex = tempindex +obj.range.length ; } ];

// 保存文件

{

[[baseStr dataUsingEncoding: NSUTF8StringEncoding] writeToFile:@"/Users/yghl010/Documents/测试/测试/live_source_n.txt" atomically:YES ];

}

} return 0;

}

```