| Spread WinRT Documentation > Formula Reference > Formula Functions > SUBSTITUTE | 
This function substitutes a new string for specified characters in an existing string.
SUBSTITUTE(text,old_piece,new_piece,instance)
This function has these arguments:
| Argument | Description | 
|---|---|
| text | String or reference to a cell containing the string in which you want to replace characters | 
| old_piece | String to be replaced | 
| new_piece | New string to use instead of existing string | 
| instance | [Optional] Which occurrence of the existing string to replace; otherwise every occurrence is replaced | 
Use this function to replace specific text with other text. Use the REPLACE function to replace a specific number of characters in a specific location with other characters.
Accepts string data for the text, old_piece, and new_piece arguments, and numeric data for the instance argument. Returns string data.
SUBSTITUTE(""Down Trend"",""Down"",""Up"") gives the result Up Trend
SUBSTITUTE(""Feb 1, 1991"",""1"",""2"", 3) gives the result Feb 1, 1992