# ReplaceRegEx | **Name** | ***ReplaceRegEx*** | | ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Syntax | ReplaceRegEx (String pattern, String searchIn, String replaceWith) | | Purpose | To scan the input string for the specified pattern and replace it with the value specified in replaceWith parameter. | | Description | If the pattern is found, it is replaced with the ‘replaceWith’ parameter, and the resulting value is returned. Otherwise, the original value is returned. | | Return Type | String | | Parameters |

pattern \[System.String] – Regular expression pattern to match

searchIn \[System.String] – String to search for a match

replaceWith \[System.String] – Replacement string

| ![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/0%20\(6\).png) **Example** In this example, we will pass the required parameters to the function transformation object using a *Variables* object. Where, *pattern* = (Mr|Mrs). *searchIn* = Mr. John *replaceWith* = Sir ![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/1%20\(6\).png) In the output window, you can see that Astera has returned a string value with the appended *replaceWith* value, as the specified *pattern* value was matched with the *searchIn* value. ![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/2%20\(6\).png)