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# Replace Algorithm Configuration Dialog Box

This dialog box enables you to select or define an algorithm for replacing specified text in message data.

To access | In the Data Masking dialog box, select a data element, and do one of the following: Under Algorithm, select Replace. For an element already configured to use the Replace function, click in the Parameters column.
Important information | When you set or change data masking settings, all data from associated operations in all data models in the service are removed.
Relevant tasks | Modify Virtual Service Behavior
See also | Data modeling

User interface elements are described below:

UI Element | Description
--- | ---
Replace using static value | Enter a string to use to replace the strings that match your specifications. For example, you might want to replace credit card data with the following value: XXXX-XXXX-XXXX-XXXX From File. Browse the file system to select a file. The data is masked using the contents of the selected file.
Replace using regular expression | Enables you to define a regular expression to match a particular string of text. You can use regular expressions in the Match pattern and Replace value fields. For help on creating regular expressions, see Configure Regular Expressions.
Match pattern | Enter the string that you want to match, or click the drop-down arrow to select a previously entered string.
Replace value | The value you want to use to replace the data that matches your Match pattern. Enter the string that you want to use to mask the data you are replacing.
Change all occurrences of regular expression | Updates all elements in all data models in the service that are using this regular expression for data masking.
Test Input | Enter a string to test your settings.
Test Output | Displays the masked output based on the settings you defined.

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