fix: use correct regex for filenames

Closes #761

lua/blink/cmp/sources/path/init.lua

@@ -1,10 +1,8 @@
 -- credit to https://github.com/hrsh7th/cmp-path for the original implementation
 -- and https://codeberg.org/FelipeLema/cmp-async-path for the async implementation
 
+local regex = require('blink.cmp.sources.path.regex')
 local path = {}
-local NAME_REGEX = '\\%([^/\\\\:\\*?<>\'"`\\|]\\)'
-local PATH_REGEX =
-  assert(vim.regex(([[\%(\%(/PAT*[^/\\\\:\\*?<>\'"`\\| .~]\)\|\%(/\.\.\)\)*/\zePAT*$]]):gsub('PAT', NAME_REGEX)))
 
 function path.new(opts)
   local self = setmetatable({}, { __index = path })
@@ -34,7 +32,7 @@ function path:get_completions(context, callback)
 
   local lib = require('blink.cmp.sources.path.lib')
 
-  local dirname = lib.dirname(PATH_REGEX, self.opts.get_cwd, context)
+  local dirname = lib.dirname(self.opts.get_cwd, context)
   if not dirname then return callback({ is_incomplete_forward = false, is_incomplete_backward = false, items = {} }) end
 
   local include_hidden = self.opts.show_hidden_files_by_default

lua/blink/cmp/sources/path/lib.lua

@@ -1,17 +1,17 @@
+local regex = require('blink.cmp.sources.path.regex')
 local lib = {}
 
---- @param path_regex vim.regex
 --- @param get_cwd fun(context: blink.cmp.Context): string
 --- @param context blink.cmp.Context
-function lib.dirname(path_regex, get_cwd, context)
+function lib.dirname(get_cwd, context)
   -- HACK: move this :sub logic into the context?
   -- it's not obvious that you need to avoid going back a char if the start_col == end_col
   local line_before_cursor =
     context.line:sub(1, context.bounds.start_col - (context.bounds.start_col ~= context.bounds.end_col and 1 or 0))
-  local s = path_regex:match_str(line_before_cursor)
+  local s = regex.PATH:match_str(line_before_cursor)
   if not s then return nil end
 
-  local dirname = string.gsub(string.sub(line_before_cursor, s + 2), '%a*$', '') -- exclude '/'
+  local dirname = string.gsub(string.sub(line_before_cursor, s + 2), regex.NAME .. '*$', '') -- exclude '/'
   local prefix = string.sub(line_before_cursor, 1, s + 1) -- include '/'
 
   local buf_dirname = get_cwd(context)