mistydennis. Form a regular expression to remove duplicate words from sentences. For example, in “My thesis is great”, “is” wont be matched twice. any character except newline \w \d \s: word, digit, whitespace Top Regular Expressions. :\\W+\\1\\b)+"; The details of the above regular expression can be understood as: “\\b”: A word boundary. Comments. 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. In a regex, * matches 0 or more instances of the preceding item, and + matches 1 or more instances. Our requirement is to have a character only once in the string. The replacement simply needs to be the String that you want to occur in your initial String where the characters identified by the regex used to be. OK, let’s go: (\w*) is any kind of word character (letters, digits, underscore – varies depending on locale settings, can f.e. Using LINQ to Remove Duplicate Characters from a string; Program Description: Here, the user will input a string and that string may contain some characters multiple times. I plan on doing this with workflow, The duplicates have already been moved out of this folder to their final storage destination. Boundaries are needed for special cases. A new method chars is added to java.lang.String class in java 8. chars returns a stream of characters in the string. Create an array of size 256 and intialize it to zero. How do you use regex to remove duplicate characters? include french letters with accents), zero or multiple times (by using the quantifier *). stringVariable.replaceAll(regex, replacement) The first parameter, the regex, needs to be, as the name calls it, a regex, as a String. A regex usually comes within this form /abc/, where the search pattern is delimited by two slash characters /. Invoking distinct method on this stream removes duplicate elements and returns another stream. At the end we can specify a flag with … So here we need to remove the duplicate characters from the string. Character classes. 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. Solution. Post Posting Guidelines Formatting - Now. Communicator ‎03-28-2019 01:52 PM. No punctuation: I need need to learn regex regex from scratch No duplicates: I need to learn regex from scratch \b: matches word boundaries \w: any word character \1: replaces the matches with the second word found - the group in the second set of parentheses In this method we will use hashing and remove all the duplicates in the input string 1. ie, 256 ASCII characters, count=0 for each character 2. Remove duplicate phrases. I have a report that requires several fields to be concatenated, each separated by a semicolon. 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