How to count string occurrence in string using JavaScript ?
In JavaScript, we can count the string occurrence in a string by counting the number of times the string is present in the string. This can be done in the following ways:
JavaScript provides a function match(), which is used to generate all the occurrences of a string in an array. By counting the array size which will return the number of times the sub-string is present in a string. Script to find the number of occurrences in a string:
Example 1: Counting occurrence of Geeks in “GeeksforGeeks” using the “match()” function.
Javascript
function gfg() { let r = "Geeks For Geeks "; console.log( (r.match(/Geeks/g)).length);}gfg() |
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The ‘g’ in the function specifies global which is used to search for an entire string rather than stop by finding the first occurrence.
Example 2: Counting occurrence of for in “GeeksforGeeks” using Loops.
Javascript
function gfg() { let s = "Geeks for Geeks"; let f = "for"; let i = 0, n = 0, j = 0; while (true) { j = s.indexOf(f, j); if (j >= 0) { n++; j++; } else break; } console.log(n);}gfg() |
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Example 3: Counting occurrence of Geeks in “GeeksforGeeks” using split() function.
Javascript
function gfg() { let s = "Geeks for Geeks"; let f = "Geeks"; let r = s.split(f).length - 1; console.log(r);}gfg() |
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Example 4: Counting occurrence of Geeks in “GeeksforGeeks” using indexof().
Javascript
function gfg() { let s = "Geeks for Geeks"; let f = "Geeks"; let r = s.indexOf(f); let c = 0; while (r != -1) { c++; r = s.indexOf(f, r + 1); } console.log(c);}gfg() |
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