InputAutoReplacements is an option for cells and notebooks which specifies strings of characters that should be replaced immediately on input.
The default setting of InputAutoReplacements for Input styles typically includes such rules as "->" -> "".
In expression input, automatic replacements can be performed only on strings of characters that correspond to complete input tokens.
In textual input, automatic replacements can be performed on strings of alphanumeric characters delimited by spaces or other punctuation characters.
When material is copied from a notebook to the clipboard, replacements specified by ExportAutoReplacements are by default performed. Typically these replacements include ones that reverse the action of the replacements in InputAutoReplacements.
When material is pasted from the clipboard into a notebook, replacements specified by ImportAutoReplacements are by default performed. Typically these replacements are a subset of those given in InputAutoReplacements.