On 10/03/2023 00:36, Matt wrote:
(concat "^" (regexp-quote org-babel-sh-prompt) " *") -> "^org_babel_sh_prompt>  
*"

Currently, the two combine via the concat to give*two*  spaces in the regexp.

"*" means zero or more, so " *" with two spaces acts like " +" one or more space characters. It is unsafe to append just "*" or "+" to another regexp since you can not ensure what is the trailing pattern of the preceding regexp.


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