Web Reference: let text = "Hello world!"; More examples below. The substring() method extracts characters, between two indices (positions), from a string, and returns the substring. The substring() method extracts characters from start to end (exclusive). The substring() method does not change the original string. Jan 16, 2026 · One common use case for substring () is when you need to extract specific substrings from a known index range. For example, you might extract the first name or last name from a full name string. You can use substring () to extract parts of a URL, such as the protocol, domain, or path. Jul 10, 2025 · substring() extracts characters from indexStart up to but not including indexEnd. In particular: If indexEnd is omitted or undefined, substring() extracts characters to the end of the string. If indexStart is equal to indexEnd, substring() returns an empty string.
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