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To allow entries that contain specific text anywhere in a cell (in the beginning, middle, or end), use the ISNUMBER function in combination with either FIND or SEARCH depending on whether you want case-sensitive or case-insensitive match: The formulas work with the following logic: You search the substring "AA" in cell A2 using FIND or SEARCH, and both return a position of the first character in the substring. For any numeric value returned as the result of search, the ISNUMBER function yields TRUE, and data validation is successful.

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With the argument set to 2, WEEKDAY returns an integer ranging from 1 (Monday) to 7 (Sunday).

So, for weekdays (Mon to Fri) the result of the formula should be less than 6, and for weekends (Sat and Sun) greater than 5.

In many situations, if you select the Ignore blank box when defining the rule (usually selected by default) and one or more cells referenced in your formula is blank, any value will be allowed in the validated cell.

Here is an example in the simplest form: When setting up a formula-based Excel validation rule, please keep in mind that all cell references in your formula are relative to the upper left cell in the selected range.

Here's how: Optionally, you can add a custom input message and Error alert that will show up when the user selects the validated cell or enters invalid data, respectively.

Below you will find a few examples of custom validation rules for different data types. All Excel data validation rules, built-in and custom, verify only new data that is typed in a cell after creating the rule.

Microsoft Excel has several built-in data validation rules for numbers, dates and text, but they cover only the most basic scenarios.

If you want to validate cells with your own criteria, create a custom validation rule based on a formula.

Excel date validation provides quite a lot of predefined criteria to restrict users to entering only dates between the two dates you specify, greater than, less than, or equal to a given date.

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