allow "&" character in primefaces keyfilter

Question

I would need a regex that allows the & character in primefaces keyfilter for a p:autocomplete field

My current keyFilter looks like this:

<p:keyFilter for="xyzComponent" preventPaste="false" regEx="/[A-Za-z-ÁÀȦÂÄǞǍĂĀÃÅǺǼǢĆĊĈČĎḌḐḒÉÈĖÊËĚĔĒẼE̊ẸǴĠĜǦĞG̃ĢĤḤáàȧâäǟǎăāãåǻǽǣćċĉčďḍḑḓéèėêëěĕēẽe̊ẹǵġĝǧğg̃ģĥḥÍÌİÎÏǏĬĪĨỊĴĶǨĹĻĽĿḼM̂M̄ʼNŃN̂ṄN̈ŇN̄ÑŅṊÓÒȮȰÔÖȪǑŎŌÕȬŐỌǾƠíìiîïǐĭīĩịĵķǩĺļľŀḽm̂m̄ʼnńn̂ṅn̈ňn̄ñņṋóòôȯȱöȫǒŏōõȭőọǿơP̄ŔŘŖŚŜṠŠȘṢŤȚṬṰÚÙÛÜǓŬŪŨŰŮỤẂẀŴẄÝỲŶŸȲỸŹŻŽẒǮp̄ŕřŗśŝṡšşṣťțṭṱúùûüǔŭūũűůụẃẁŵẅýỳŷÿȳỹźżžẓǯßœŒçÇ0-9! \/ \.\?_-]/i"/>

i tried & and \& inside the "[]", but I get the following error:

Error Parsing xyz.xhtml : Error Traced[line: 82] The entity name must immediately follow the '&' in the entity reference.