Web Reference: The substr() method extracts a part of a string. The substr() method begins at a specified position, and returns a specified number of characters. The substr() method does not change the original string. To extract characters from the end of the string, use a negative start position. Regular expressions provide a powerful weapon to extract substrings based on patterns. In JavaScript, the String.prototype.match()method can be used with a regular expression to extract substrings. This example will get all the words whose length is greater than 5: Output: This method is very flexible, and you can customize it to suit your purposes... Jan 16, 2026 · The substring () method is used to extract a portion of a string. It returns a new string without changing the original one. Extracts characters between two given indices. The ending index is not included in the result. The original string remains unchanged.
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