\xHH escapes in string literal are expanded

[vain0x]

Issue created from fantomas-online

Code

"\x00"

Result

"�"

Problem description

Hex escapes that look like \xHH in string literals are expanded to the escaped characters.

Extra information

• The formatted result breaks by code.
• The formatted result gives compiler warnings.
• I or my company would be willing to help fix this.

Options

Fantomas Master at 03/05/2021 14:51:06 - 69fd7ea

Default Fantomas configuration

_{Did you know that you can ignore files when formatting from fantomas-tool or the FAKE targets by using a .fantomasignore file?}

[nojaf]

Hello @vain0x, thank you for reporting this issue.
I believe it can be solved by adding x to this regex:

fantomas/src/Fantomas/TokenParser.fs

Lines 509 to 510 in ba5b44e

	let escapedCharacterRegex =
	System.Text.RegularExpressions.Regex("(\\\\(n|r|u|'|\\\"|\\\\))+")

Would you be interested in submitting a PR?

[vain0x]

Thank you. I have submitted a PR.