Regular expression for validating filename

do Get() method is used to get information, while do Post() method is used for posting Get() requests can't send large amount of information and is limited to 240-255 characters. Get Invalid Path Chars If In Str(name, bad Char) This example does not check if the name has incorrectly placed colons, or directories with no name, or if the length of the name exceeds the system-defined maximum length.

Recently I was looking for a regular expression to validate a file path and extension.

I found several of them on Google but none of them fit my requirement.

Syntactic validation should enforce correct syntax of structured fields (e.g.

SSN, date, currency symbol) while semantic validation should enforce correctness of their values in the specific business context (e.g.

Input validation can be used to detect unauthorized input before it is processed by the application.

Input validation can be implemented using any programming technique that allows effective enforcement of syntactic and semantic correctness, for example: , where the ' character is fully legitimate.

User will enter only first part of file: For example user is saving new file with name "This Ismyfile.pdf".

User will enter only "This Ismyfile" and task is to check is this string correct for file name.

I'm Nataraja Gootooru, programmer by profession and passionate about technologies.

All examples given here are as simple as possible to help beginners.

Function Is Valid File Name Or Path(By Val name As String) As Boolean ' Determines if the name is Nothing. It also does not check if the application has permission to access the file-system resource with the specified name.