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Detect and remove Emoticons from Text on Windows Phone

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Detect and remove Emoticons from Text on Windows Phone

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In my recent project, I work with a lot of text that get’s its value from user input. To enable the best possible experience for my users, I choose the InputScope Text on all TextBoxes, because it provides the word suggestions while writing.

The Text will be submitted to a webserver via a REST API. And now the problem starts. The Emoticons that are part of the Windows Phone OS are not supported by the API and the webserver.

Of course, I was immediately looking for a way to get around this. I thought this might be helpful for some of you, so I am sharing two little helper methods for detecting and removing the Emoticons.

Here is my detecting method, that returns a bool after checking the text (input):

public static bool HasUnsoppertedCharacter(string text)
                string pattern = @"[.{allemoticonshere}]";

                Regex RegexEmoticonsKeyboard = new Regex(pattern);

                bool booleanreturnvalue = false;

                if (RegexEmoticonsKeyboard.IsMatch(text))
                    booleanreturnvalue = true;
                else if (!RegexEmoticonsKeyboard.IsMatch(text))
                    booleanreturnvalue = false;
                return booleanreturnvalue;

As you can see, I declared a character range with all Emoticons. If one or more Emoticons is found, the bool will always return true. This can be used to display a MessageBox for example while the user is typing.

The second method quietly removes the Emoticon from any text that is passed as input string.

 public static string RemovedUnSoppertedCharacterString(string text)
                 string result = string.Empty;
                 string cleanedResult = string.Empty;
                 string pattern = @"[.{allemoticonshere}]";

                 MatchCollection matches = Regex.Matches(text, pattern);

                 foreach (Match match in matches)
                     result = Regex.Replace(text, pattern, string.Empty);
                     cleanedResult = Regex.Replace(result, "  ", " ");
                 return cleanedResult;

Also here I am using the character range with all Emoticons. The method writes all occurrences of Emoticons into a MatchCollection for Regex. I iterate trough this collection to remove all of them. The Method also checks the string for double spaces in the text and makes it a single space, as this happens while removing the emoticons. Use this method with care, as it could be seen as a data loss from your users.

You might have notices that there is a placeholder “{allemoticonshere}” in the code above. WordPress or the code plugin I use aren’t supporting the Emoticons in code, that’s why I attached my helper class.

As always, I hope this will be helpful for some of you.

Happy coding!

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Published at DZone with permission of Marco Siccardi, DZone MVB. See the original article here.

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