![]() From the DATA tab, click the Data Validation button, then select Data. To use data validation to allow a list of specific characters only, you can use a rather complicated array formula based on the COUNT, MATCH, and LEN functions. In Excel, custom input or error messages explain the rules for each field to. Some of the types of data validation include: Code validation. These rules are generally defined in a data dictionary or are implemented through data validation software. You can also open the Data Validation dialog box by pressing Alt > D > L, with each key pressed separately. Select one or more cells to validate, go to the Data tab > Data Tools group, and click the Data Validation button. ![]() To add data validation in Excel, perform the following steps.
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