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Escaping wildcards in Perforce filenames

To refer to files containing the Perforce revision specifier wildcards (@ and #), file matching wildcard (*), or positional substitution wildcard (%%) in either the file name or any directory component, use the ASCII expression of the character’s hexadecimal value. ASCII expansion applies only to the following four characters:

• @ becomes %40
• # becomes %23
• * becomes %2A
• % becomes %25

Extract from Perforce documentation on File Specifications (link).