To ignore any file starting with ~(tilde), I put following in gitignore file
^~.*
But, it is not working for the file name starting with ~(eg. ~$ofession email.docx).
There is no issue with gitignore configuration setting as other patterns are working well.
What is wrong here with the regular expression?
Regular expressions are not supported in .gitignore, you can use globs only. To fix it, use ~*, that will ignore anything starts with tilde.