Web Reference: How can I count the number of times a particular string occurs in another string. For example, this is what I am trying to do in Javascript: var temp = "This is a string."; alert (temp.count ("is"))... Jan 16, 2026 · Counting the occurrences of a substring within a string is a common task in JavaScript programming, with applications ranging from text analysis (e.g., keyword frequency in articles) to form validation (e.g., checking for profanity) and search functionality (e.g., displaying "5 results found"). Jul 11, 2025 · The match () method with a global regular expression is the most efficient and widely used method for counting substring occurrences. For specific cases, such as overlapping matches or advanced patterns, regular expressions provide flexibility.
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