Numbers are not allowed in inline @var comment type hints and variable names

The existing regexp for checking type hints and variable names of inline @var comments doesn't allow numbers:

^/\*\* @var [a-zA-Z_\\\\\[\]|]+ \$[a-zA-Z_]+ \*/$

PHP gives the following regexp for valid class names:

^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$

Here's my attempt at combining the two:

^/\*\* @var \\\\?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff\\\\\[\]|]* \$[a-zA-Z0-9_]+ \*/$