JS string manipulation function

Concat () – combines two or more characters of text to return a new string.
IndexOf () – returns the index at the first occurrence of a substring in a string. If there is no match, returns-1.
CharAt () – returns the character at the specified position.
LastIndexOf () – Returns the index of the last occurrence of a substring in a string, or 1 if there is no match.
Match () – checks whether a string matches a regular expression.
SUBSTRING () – Returns a substring of the string. Incoming parameters are the start and end positions.
Replace () – Used to find a string that matches a regular expression, and then use the new string instead of the matching string.
Search () – performs a regular expression matching lookup. If the lookup succeeds, returns the matching index value in the string. otherwise returns-1.
Slice () – Extracts part of a string and returns a new string.
Split () – A string is made into a string array by dividing the string into substrings.
length– returns the length of a string, the length of which is the number of characters it contains.
toLowerCase () – Converts the entire string into lowercase letters.
toUpperCase () – turns the entire string into uppercase.

JS string manipulation function