We check the "haven't made any changes" criteria by using two variables - a "before" and an "after". And if you need it put back into a string you can rebuild the string from the list. In this article, we will discuss how to remove duplicate characters from a String. Define a string. I also found this Regex Matcher Tutorial helpful. 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. In above example, the words highlighted in green are duplicate words. HackerRank Problem Java Regex 2 – Duplicate Words Solution September 1, 2017 April 1, 2018 Shrenik 3 Comments In this challenge, we use regular expressions (RegEx) to remove instances of words that are repeated more than once, but retain the first occurrence of any case-insensitive repeated word. 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 Java Regex 2 - Duplicate Words. 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. Next, use the regular expression to remove consecutive repeated words. To find the duplicate words from the string, we first split the string into words. 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. 1) Split input sentence separated by space into words. If count is greater than 1, it implies that a word has duplicate in the string. We count the occurrence of each word in the string. Solution. 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. Invoking distinct method on this stream removes duplicate elements and returns another stream. 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. Editorial. Given a string, we have to remove all duplicate/repeated words from the string. Since our string contained words separated by a space, we first split the string by one or more space characters. 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. Ie. Java solution - passes 100% of test cases. I'm assuming that the 'separator' between the words is unimportant. Leaderboard. 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. Submissions. 3) Now create a dictionary using Counter method having strings as keys and their frequencies as values. Problem. 2) So to get all those strings together first we will join each string in given list of strings. 4) Join each words are unique to form single string. Discussions. Algorithm. A new method chars is added to java.lang.String class in java 8. chars returns a stream of characters in the string. This will also remove duplicates that are not 'next to' each other within the string. 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. Java Regex 2 - Duplicate Words. How to match duplicate words in a regular expression? 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