The indexOf() method returns the position of the first occurrence of a value in a string. The indexOf() method returns -1 if the value is not found. The indexOf() method is case sensitive.

Mar 13, 2025 · The indexOf() method of String values searches this string and returns the index of the first occurrence of the specified substring. It takes an optional starting position and returns …

function findRegexIndices(text, needle, caseSensitive){ var needleLen = needle.length, reg = new RegExp(needle, caseSensitive ? 'gi' : 'g'), indices = [], result; while ( (result = reg.exec(text)) ) { …

Sep 30, 2024 · The indexOf() method in JavaScript is used to find the index of the first occurrence of a specified value within a string. The method returns a 0-based index, making it a …

Aug 24, 2021 · In this tutorial, we will learn the difference between string primitives and the String object, how strings are indexed, how to access characters in a string, and common properties …

In this tutorial, you'll learn how to use the JavaScript String indexOf() method to find the index of a substring within a string.

Feb 5, 2025 · This guide will delve into the concept of string indexing in JavaScript, covering how to access characters using indices, the zero-based nature of indexing, and practical examples. …

The JavaScript String indexOf() method is used to find the index of the first occurrence of the specified substring in the original string. It returns the position of the substring, or -1 if the …

The JavaScript string indexOf method provides a fast, flexible way to find characters or words within strings. From email validation to string slicing, it's a dependable tool in your everyday …

The indexOf() method returns the index (position) of the first occurrence of a string in a string, or it returns -1 if the string is not found: let text = "Please locate where 'locate' occurs!"; JavaScript …