# Find/Replace Find/Replace searches a table for provided string and replaces it with another string. Multiple find/replace rules may be applied in a single tool, and they may be applied to an entire table or specified columns. Three options exist for how to identify strings within the given table: * **Find by string**: enter strings to find/replace. Option to allow matches with entire cells or partial matches within cells. * **Find by regex**: use regular expressions to match cell segements. Replace with the provided string. * **Find by delimiter**: Enter starting and ending delimiters, any strings between the provided delimiters will be replaced. To find/replace null values, select "Find by String" and simply type "null" into the find box. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.cascade.io/cascade/tools/cleaning/findreplace.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.