RightTrim

RightTrim is a term used in string processing to describe an operation that removes trailing characters from the right end of a string. The most common target is whitespace, but some implementations allow a custom set of characters to be removed.

In practice the exact name and behavior vary by language. For example, PHP provides rtrim, JavaScript offers String.prototype.trimEnd or trimRight, Python provides rstrip, and C# exposes TrimEnd. Some libraries or languages may expose a function named rightTrim. The function typically treats whitespace as the default trim target, while some variants accept an explicit set of characters to remove from the end.

How it works: starting from the end of the string, the function checks whether each character is in the trim set; as long as it is, it moves left. When a character not in the trim set is encountered, the function returns the substring up to that point. If no characters are trimmed, the original string is returned. If all characters are trimmed, an empty string is returned. The operation is generally linear in the length of the input and does not alter characters to the left of the first non-trim character.

Common use cases include removing trailing whitespace after user input, stripping end-of-line markers in text processing, and removing a specified set of trailing characters (for example, trailing zeros or punctuation). See also leftTrim and trim for symmetric or global trimming functionality.