fix: wildcard match does not escape special regex characters

[skwasjer]

F.ex.:

path/file.jpg?width=* was previously converted to a regex @"^(path/file.jpg?width=).*". This has a few problems:

• the . (dot) in the filename matches any character in that position, not just the dot.
• the ? makes the preceding g in jpg an optional character so jp matches just as well. In fact path/file.jpg?width=123 would not actually match because after the optional g, the w is now expected.

All special regex characters are now escaped, iow. the above example would be: @"^(path/file\.jpg\?width=).*"

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
88.9% Coverage on New Code
0.0% Duplication on New Code

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