How to Validate Text field for only English and French characters
To prevent users from inputting any other characters other than French and English, you can do the following for questions that support Logic:Question validation equation (like Short Text). Also, be sure to add a validation message (separate English and French) to explain what input is allowed.

This is the expression you need to use:

regexMatch("/^[a-zA-ZÀÂÉÊÈËÌÏÎÔÙÛÇÆŒàâéêèëìïîôùûçæœ '-]{3,100}$/",html_entity_decode(self.NAOK))

Note: The {3,100} ensures there are at least 3 characters, and a maximum of 100

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