fix regression, match unicode characters

plugin/core/signature_help.py

@@ -116,8 +116,10 @@ def _render_label(self, view: sublime.View, signature: SignatureInformation) ->
                     # route relies on the client being smart enough to figure where the parameter is inside of
                     # the signature label. The above case where the label is a tuple of (start, end) positions is much
                     # more robust.
-                    label_match = re.search(r"\b{}\b".format(rawlabel), label[prev:])
-                    start = label_match.start() if label_match else -1
+                    label_match = re.search(r"\W{}\W".format(rawlabel), label[prev:])
+                    start = -1
+                    if label_match:
+                        start = label_match.start() + 1  # skip the first matched \W by adding + 1
                     if start == -1:
                         debug("no match found for {}".format(rawlabel))
                         continue