Java solution - passes 100% of test cases. And if you need it put back into a string you can rebuild the string from the list. Here is the expected output for some given inputs : Input : topjavatutorial Output : topjavuril Input : hello Output : helo The below program that loops through each character of the String checking if it has already been encountered and … Url Validation Regex | Regular Expression - Taha match whole word Match or Validate phone number nginx test Blocking site with unblocked games Match html tag Match anything enclosed by square brackets. 2) So to get all those strings together first we will join each string in given list of strings. This will also remove duplicates that are not 'next to' each other within the string. I also found this Regex Matcher Tutorial helpful. I'm assuming that the 'separator' between the words is unimportant. If count is greater than 1, it implies that a word has duplicate in the string. Submissions. Discussions. Since our string contained words separated by a space, we first split the string by one or more space characters. Editorial. 1) Split input sentence separated by space into words. Java Regex 2 - Duplicate Words. We count the occurrence of each word in the string. 4) Join each words are unique to form single string. A new method chars is added to java.lang.String class in java 8. chars returns a stream of characters in the string. Once we had all the words in the form of a String array, we converted the String array to LinkedHashSet using the asList method of the Arrays class.Since the Set does not allow duplicate elements, duplicate words were not added to the LinkedHashSet. Following example shows how to search duplicate words in a regular expression by using p.matcher() method and m.group() method of regex.Matcher class. How to match duplicate words in a regular expression? In above example, the words highlighted in green are duplicate words. Problem. Re: most efficient regex to delete duplicate words by maverick (Curate) on Aug 14, 2001 at 00:40 UTC: Here's a non regexp solution. Method 4: Using java 8 streams Java 8 has introduced the concept of streams where an array can be represented as a sequence of elements and operations can be performed on those elements. The regular expression handles only one duplicate at a time, so we use a loop to go through until we haven't made any changes. Examples: Input: str = “Geeks for Geeks A Computer Science portal for Geeks” Output: Geeks for A Computer Science portal Explanation: here ‘Geeks’ and ‘for’ are duplicate so these words are removed from the string Define a string. Algorithm. I think I've read about a way to do it using regular expressions instead, but I'm afraid it's not my area of expertise. Java Regex 2 - Duplicate Words. Invoking distinct method on this stream removes duplicate elements and returns another stream. Ie. To find the duplicate words from the string, we first split the string into words. Given a string, we have to remove all duplicate/repeated words from the string. Next, use the regular expression to remove consecutive repeated words. Leaderboard. Solution. In this article, we will discuss how to remove duplicate characters from a String. As the problem statement says: you will fail the challenge if you modify anything other than the three locations that the comments direct you to complete Regular Expression Reference. We check the "haven't made any changes" criteria by using two variables - a "before" and an "after". 3) Now create a dictionary using Counter method having strings as keys and their frequencies as values. 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