pcomplete--env-regexp
pcomplete--env-regexp is a variable defined in `pcomplete.el'.
Its value is
"\\(?:\\`\\|[^\\]\\)\\(?:\\\\\\\\\\)*\\(\\$\\(?:{\\([^}]+\\)}\\|\\(?2:[[:alnum:]_]+\\)\\)\\)"
- This variable may be risky if used as a file-local variable.