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Returns a substring beginning at a specified location and having a specified length.
stringvar.substr(start [, length ])
The substr method syntax has these parts:
Part Description stringvar Required. A string literal or String object from which the substring is extracted. start Required. The starting position of the desired substring. The index of the first character in the string is zero. length Optional. The number of characters to include in the returned substring.
If length is zero or negative, an empty string is returned. If not specified, the substring continues to the end of stringvar.