Convert HTML string to plain text by deleting HTML tags and replacing escaped sequences.

gistfile1.m

- (NSString *)stringByDeletingHTML {
    // Delete HTMl tags.
    /// http://stackoverflow.com/questions/277055/remove-html-tags-from-an-nsstring-on-the-iphone
    NSRange range;
    NSMutableString *string = [self mutableCopy];
    while ((range = [string rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
        [string deleteCharactersInRange:range];
    
    // Replace escaped sequences.
    NSDictionary *escapes = @{
                              @"&quot;": @"\"",
                              @"&apos;": @"",
                              @"&lt;"  : @"",
                              @"&gt;"  : @"",
                              @"&amp;" : @"&", // Should be last.
                              };
    for (NSString *toFind in escapes) {
        NSString *toReplace = [escapes objectForKey:toFind];
        [string replaceOccurrencesOfString:toFind withString:toReplace options:0 range:NSMakeRange(0, string.length)];
    }
    
    // Replace &#0000; by corresponding Unicode character.
    while ((range = [string rangeOfString:@"&#[0-9]+;" options:NSRegularExpressionSearch]).location != NSNotFound) {
        NSString *unicodeNumber = [string substringWithRange:NSMakeRange(range.location+2, range.length-3)];
        NSString *replacement = [NSString stringWithFormat:@"%C", (unichar)unicodeNumber.intValue];
        [string replaceCharactersInRange:range withString:replacement];
    }
    
    return string;
}