Objective c NSString匹配字符串开头，如果匹配，则替换该字符串

这是我的字符串：

<meta name=3D"viewport" content=3D"width=3Ddevice-width=2C initial=-scale=3D1.0">

在我处理它之后，它变成：

  <meta test>
  <meta 2>

简言之：

搜索：

  <meta test>
  <meta 2>

NSString *string = @"<meta name=3D\"viewport\" content=3D\"width=3Ddevice-width=2C initial=-scale=3D1.0\">";
NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"<meta name=3D\"viewport[^>]*>" options:NSRegularExpressionCaseInsensitive error:&error];
NSString *modifiedString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:@""];
NSLog(@"%@", modifiedString);