org-vcard--escape-value-string duplicates escaping on already escaped sequences

[Seme4eg]

In exported .vcf file from phone lets say there is a string NOTE:some note here and \, escaped char

On importing this .vcf file to .org file the string remains unchanged.

But when exporting it back from .org file to .vcf file it becomes NOTE:some note here and \\\, escaped char

I tried to fix that by rewriting the func to use negation like (regex (concat "[^\134]\\([" symbols "]\\)")) but i am too noob at lisp, couldn't make it work, so - making an issue.

[pinoaffe]

Thank you for the report! org-vcard currently uses an ad-hoc parser for vcf files, I'll try and see if it can reasonably be modified to properly handle escaped string values - I think this should be feasible, but if not, fixing this will take longer, as it would have to wait until we implement a more proper (and more correct) vCard parser