How to Search a String for a Pattern in JavaScript ? Last Updated : 12 Nov, 2024 Comments Improve Suggest changes Like Article Like Report Here are two ways to search a string for a pattern in JavaScript.1. Using string search() MethodThe JavaScript string search() method is used to serch a specified substing from the given string and regular expression. It returns the index of the first occurrence of the pattern or -1 if the pattern is not found.Syntaxstr.search( pattern ) JavaScript // Given String let s = "GeeksforGeeks"; // Defining the patterns using regular expressions. let p1 = /G/; // pattern to find G let p2 = /k/; // pattern to find k let p3 = /p/; // pattern to find p // Get the position of patten using string.search() // and Display the output console.log("The index of G is:", s.search(p1)); console.log("The index of k is:", s.search(p2)); console.log("The index of p is:", s.search(p3)); OutputThe index of G is: 0 The index of k is: 3 The index of p is: -1 2. Using string match() MethodThe string match() method is used to get all matching substrings. It returns an arrray of all substrings if the pattern is found or null if no match is found.Syntaxstring.match( expression ) JavaScript // Given String let s = "GeeksforGeeks"; // Get the position of patten using string.search() // and Display the output console.log("The Occurence of Ge:", s.match(/rGe/g)); console.log("The Occurence of ee:", s.match(/ee/g)); console.log("The Occurence of sf:", s.match(/re/g)); OutputThe Occurence of Ge: [ 'rGe' ] The Occurence of ee: [ 'ee', 'ee' ] The Occurence of sf: null Comment More infoAdvertise with us Next Article How to Search a String for a Pattern in JavaScript ? S souvikm02 Follow Improve Article Tags : JavaScript Web Technologies JavaScript-Methods JavaScript-Questions Similar Reads How to Search for Multiple Words Within a String or Array in JavaScript? 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