global：invalid regular expression.

[yunyanan]

Hi, about ten days ago, my gtags can't be used normally, when I use counsel-gtags-find-definition and counsel-gtags-find-reference commands, emacs will give me an error message: global：invalid regular expression.

some version information ：

OS: Ubuntu 1604 Emacs version: 26.2 Global version: 6.6 My emacs config:

(use-package counsel-gtags :ensure t :init (add-hook 'c-mode-hook 'counsel-gtags-mode) (add-hook 'after-save-hook 'counsel-gtags-update-tags) :bind (:map counsel-gtags-mode-map ("M-t" . counsel-gtags-find-definition) ("M-r" . counsel-gtags-find-reference) ("M-s" . counsel-gtags-find-symbol) ("M-," . counsel-gtags-go-backward)))

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I've tried to reinstall global and counsel-gtags to address the problem，but I failed. I've noticed that counsel-gtags have been updated recently，so I'm guessing if it's because of the gtags update. When I rolled back the gtags version to 5df12da 29 days ago, the problem went away, but I don't know why?