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VistasREGEX: How to allow exclusive latin characters (like accents)?
So if you ever need a regular expression to verify whether a name has been inputted correctly for instance, and you want it to allow only Latin characters and accents, here's a solution:
\^([A-Za-zÀ-ÖØ-Ý]){2,20}$\
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But I owe you an explanation as to why we have À-ÖØ-Ý and not just À-Ý
Foremost, this explanation what made exclusively for beginners:
When you use [A-Z], you capture any ASCII character between A and Z : you capture a range.
If you look at the Unicode U0000 character map/ASCII Table (see below), you'll notice that it matches exactly all uppercase.
In the same way, you can capture the 4 last lines of the Unicode U0080:
Though, you may realize that the multiplication (×) and division (÷) symbols are within that range.
Which is a problem because users (especially mobile users) could bypass the "only Latin letters" rule.
So to fix this issue we need to create 2 range of characters excluding these 2 characters.
Hence, why the À-ÖØ-Ýfor uppercase letters with accents and à-öø-ÿ for lowercase letters with accents.
I hope this will be useful to some people!
If you have any questions don't hesitate to ask them!
Sources:
https://fr.wikipedia.org/wiki/American_Standard_Code_for_Information_Interchange
https://fr.wikipedia.org/wiki/Table_des_caract%C3%A8res_Unicode/U0080
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Saul Orozco Alvarez
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Saul Orozco Alvarez