Highlighter prints things when regex highlighting is triggered for the 1st time after login:

[Leedehai]

This is my addition to zsh-syntax-highlighting/highlighters/regexp/regexp-highlighter.zsh imediately after the line typeset -gA ZSH_HIGHLIGHT_REGEXP:

# Highlight 'ls' and 'cd'
ZSH_HIGHLIGHT_REGEXP+=('(^| )(ls|cd)($| )' 'fg=green')

Everytime the regex is triggered for the 1st time after login, the terminal prints things. The 2nd time and beyond, it works fine

Last login: Mon Jan 22 19:28:18 on ttys000
▸ ~ ls
_zsh_highlight_regexp_highlighter_loop:6: array parameter match created globally in function _zsh_highlight_regexp_highlighter_loop
_zsh_highlight_regexp_highlighter_loop:6: array parameter mbegin created globally in function _zsh_highlight_regexp_highlighter_loop
_zsh_highlight_regexp_highlighter_loop:6: array parameter mend created globally in function _zsh_highlight_regexp_highlighter_loop
▸ ~ ls
Applications   Downloads      Movies         Public         pymel.log      vscode
Desktop        GoogleDrive    Music          VirtualBox VMs safe-rm.sh     vscode.zip
Documents      Library        Pictures       anaconda2      settings.json  xgen
▸ ~

This behavior repeats if your logout and login again.

[phy1729]

Thanks for the bug report with reproducer! Does the latest commit to master fix the issue?

[Leedehai]

Whoops, sorry I must have missed the message at that time! It was definitely not my intention to be rude by not responding. I stumbled across this today when I was googling and was surprised it was me who filed this bug..
Yes, it fixed it. Finally I can remove the comment sign in ~/.zshrc to enable this plugin! zsh-syntax-highlighting was hidden after a comment sign for more than 2 years :)

[danielshahaf]

Thanks for letting us know it works for you now! :-)