Only in the production environment, the error "Bad Regex format: Invalid regular expression: /,*pureri(PC)/g: Unmatched ')'" appears

We are experiencing a situation where something that works fine under our test environment is causing errors in our production environment.

The details are as follows.
We are asking because we have never had such an error in the production environment, even though there was no problem in the test environment in the past,

We apologize for the inconvenience, but we would appreciate an answer as soon as possible, as this information has already been released to the public.

Error contents
Messages can be sent on the relevant page in the development environment, but not in the production environment.

Error text
Bad Regex format: Invalid regular expression: /,*pureri(PC)/g: Unmatched ‘)’.

◇video

◇Explanation of Video Content
(1) Open the Thread screen of the Live environment and click on Comments.
(2) Go to the Thread_reply screen in the Live environment, enter your message in the bottom input box, and send it.
→The contents of the message are not displayed.
(3) Open the Chat_list screen in the Live environment and open one of the chats.
(4) Go to the Chat screen in the Live environment, enter a message in the bottom input box, and send it.
→4) Go to the Chat screen in the Live environment, enter a message in the bottom input box, and send it.
Open the Thread screen of the development environment and click “Comment”.
(6) Go to the Thread_reply screen in the live environment, enter a message in the bottom input box, and send it.
→The contents of the message are displayed correctly.
(7) Open the Chat_list screen in the development environment and open one of the chats.
(8) Go to the Chat screen of the development environment, enter a message in the bottom input box, and send it.
→Enter your message in the bottom input box and send it.

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