8/27/2023 0 Comments Java regex whitespaceAmong the first appearances of regular expressions in program form was when Ken Thompson built Kleene's notation into the editor QED as a means to match patterns in text files. Regular expressions entered popular use from 1968 in two uses: pattern matching in a text editor and lexical analysis in a compiler. Other early implementations of pattern matching include the SNOBOL language, which did not use regular expressions, but instead its own pattern matching constructs. These arose in theoretical computer science, in the subfields of automata theory (models of computation) and the description and classification of formal languages. Regular expressions originated in 1951, when mathematician Stephen Cole Kleene described regular languages using his mathematical notation called regular events. Stephen Cole Kleene, who introduced the concept Regular expressions are supported in many programming languages. Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax. They came into common use with Unix text-processing utilities. The concept of regular expressions began in the 1950s, when the American mathematician Stephen Cole Kleene formalized the concept of a regular language. Regular expression techniques are developed in theoretical computer science and formal language theory. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. highlights show the match results of the regular expression pattern /h+/g (the letter h followed by one or more vowels)Ī regular expression (shortened as regex or regexp sometimes referred to as rational expression ) is a sequence of characters that specifies a match pattern in text. String noSpaceStr2 = stringBuffer.toString() Print the string after the removal of white space StringBuffer stringBuffer = new StringBuffer() įor (int i = 0 i < strArray.length i++) If any are found, then use the append string. Use an if condition to check for white spaces. Use a for loop to iterate through all the characters of the string Here, we will ask the user to enter a string and then we will remove the whitespaces from the string by converting it to a char array. In this program, we will see how to remove all the whitespace from a string when the string is user-defined. Program 3: Remove White Spaces from a String in Java ("After Removing Whitespaces the entered string is: "+str) In this program, we will see how to remove all the whitespace from a string when the string is pre-defined in the program. Program 2: Remove White Spaces from a String ("After Removing Whitespaces the entered string is:"+str) Īfter Removing Whitespaces the entered string is: StudyTonight String str=sc.nextLine() //Initialize the String Java Program to remove all the whitespace from a string Use the replaceAll to remove the regular expression \\s that finds all white space characters (tabs, spaces, newline characters, etc.) in the string with ""(empty space literal).īelow is the Java code to remove white space from the String. Here, we will ask the user to enter a string and then we will remove the whitespaces from the string. Program 1: Remove White Spaces from a String Let us look at the examples for better understanding. Output: The entered string after removal of white spaces is: StudyTonight But before moving further, if you are not familiar with the concept of string, then do check the article on Strings in Java. If anything is matched, then any built-in method like replace() can be used to remove the white space. This can be done by first traversing the string and then checking if any character of the string is matched with a white-space character or not. In this tutorial, we will learn how to remove the whitespaces from a string.
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