从UITextView文本的特定单词中检测下划线

Question

I want to detect "_" from a particular word of a UITextView's text.
I already tried this :

But this calculates the range of first underscore only.

 NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:textView.text]; NSRange range=[textView.text rangeOfString:@"_"]; [string addAttribute:NSForegroundColorAttributeName value:[UIColor clearColor] range:range]; textView.attributedText=string; 

My output is coming like this

Tadeusz_Kościuszko was a military leader who became a national hero in Poland. A poster for the Paris premiere of Jules_Massenet's 1910 opera Don_Quichotte.

And I want something like this:

Tadeusz Kościuszko was a military leader who became a national hero in Poland. A poster for the Paris premiere of Jules Massenet's 1910 opera Don Quichotte.

Also I want to clear color the underscores just from the names. Not from the other text of UITextView.

I dont want to remove it from the whole text of UITextView but just from the particular words.
Anyone having suggestions?
Thanks.

Answer 1

textView.text = [textView.text stringByReplacingOccurrencesOfString:@"_" withString:@" "];

Answer 2

NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:textView.text];


NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(_)" options:kNilOptions error:nil];


NSRange range = NSMakeRange(0,string.length);

[regex enumerateMatchesInString:string options:kNilOptions range:range usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {

    NSRange subStringRange = [result rangeAtIndex:1];
    [string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:subStringRange];
}];

textView.attributedText=string;

Answer 3

NSString *str = @"This_is_a_string";

str = [str stringByReplacingOccurrencesOfString:@"_"
                                     withString:@" "];

// str = "This is a string"

More on NSString

Answer 4

try this -

NSString *str   =   @"Tadeusz_Kościuszko was a military leader who became a national hero in Poland. A poster for the Paris premiere of Jules_Massenet's 1910 opera Don_Quichotte.";
    NSString *newStr    =   [str stringByReplacingOccurrencesOfString:@"_" withString:@" "];
    NSLog(@"NEW STR ::::: %@",newStr);

Answer 5

Found the workaround :)

NSString *strTemp = textView.text;

 NSMutableAttributedString *mutString = [[NSMutableAttributedString alloc]initWithString:strTemp]; NSString *substring = @"_"; NSRange searchRange = NSMakeRange(0,mutString.length); NSRange wholeTextRange = [strTemp rangeOfString:strTemp]; [mutString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:wholeTextRange]; NSRange foundRange; while (searchRange.location < mutString.length) { searchRange.length = mutString.length-searchRange.location; foundRange = [strTemp rangeOfString:substring options:nil range:searchRange]; if (foundRange.location != NSNotFound) { // found an occurrence of the substring! do stuff here [mutString addAttribute:NSForegroundColorAttributeName value:[UIColor clearColor] range:foundRange]; searchRange.location = foundRange.location+foundRange.length; } else { // no more substring to find [txtComment setAttributedText:mutString]; break; } } 

Answer 6

If you want to selectively remove underscores you need to know the range of text from which you want to remove them.

Then you can use a regular expression to get an array of ranges which match the underscore in that known range.

NSError *error;
NSRegularExpression *regex =  [NSRegularExpression regularExpressionWithPattern:@"_" options:0 error:&error];
NSArray *matchingRangesInSelectedRange = [regex matchesInString:yourString options:0 range:knownRangeToCheckForMatches];

You can then iterate over the ranges in the array and do whatever changes you wish.

Answer 7

If you know which strings should not be cleaned or which that should not be cleaned you could do something like this:

NSString *stringWithUnderScore = @"A rather long text with some_odd_underscores but also names like André_Franquin & Albert_Uderzo";
NSSet *stringsThatShouldKeepUnderscore = [NSSet setWithObjects:@"some_odd_underscores", nil];
NSArray *singleStrings = [stringWithUnderScore componentsSeparatedByString:@" "];
NSMutableString *newCompleteString = [[NSMutableString alloc] init];

for (NSString *singleString in singleStrings) {
        if (![stringsThatShouldKeepUnderscore containsObject:singleString]){
            NSString *fixedString = [singleString stringByReplacingOccurrencesOfString:@"_" withString:@" "];
            [newCompleteString appendString: fixedString];
        } else{
            [newCompleteString appendString:singleString];
        }
        [newCompleteString appendString:@" "];
    }

NSLog(@"new string:%@",newCompleteString);

Edit: If you do not have this information you could try to make some kind of parser checking if each of the strings separated by "_" have capital-letters, indicating a name. Not fail-safe, but without knowledge about the text I can't really see any better option.