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I already gone through some question in StackOverflow regarding this but nothing helped much in my case.
I want to restrict the user to provide a filename that should contain only alphanumeric characters, -, _, . and space.
I’m not good in regular expressions and so far I came up with this ^[a-zA-Z0-9.-_]$. Can somebody help me?
This is the correct expression:
\wis equivalent of[0-9a-zA-Z_].