A version of projectile-replace function that works with regexps. Be careful when using it on huge projects.

projectile-replace-regexp.el

(defun projectile-replace-regexp ()
  "Replace a string in the project using `tags-query-replace'.
Less efficient than `projectile-replace' but at least allows
usage of regular expressions. See
https://github.com/bbatsov/projectile/issues/576 for more details
on `projectile-replace' issue with regexps."
  (interactive "P")
  (let* ((old-text (read-string
                    (projectile-prepend-project-name "Replace: ")
                    (projectile-symbol-or-selection-at-point)))
         (new-text (read-string
                    (projectile-prepend-project-name
                     (format "Replace %s with: " old-text))))
         (files (-map (lambda (f) (concat (projectile-project-root) f)) (projectile-current-project-files))))
    (tags-query-replace old-text new-text nil (cons 'list files))))