Validating filename

If the input field comes from a fixed set of options, like a drop down list or radio buttons, then the input needs to match exactly one of the values offered to the user in the first place.Free-form text, especially with Unicode characters, is perceived as difficult to validate due to a relatively large space of characters that need to be whitelisted.

then the developer should be able to define a very strong validation pattern, usually based on regular expressions, for validating such input.Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components.Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.Input validation should be applied on both syntactical and semantic level.Syntactic validation should enforce correct syntax of structured fields (e.g.

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