Autoformat specified text into link

[Problemsolver]

Would be nice if you could (for example) add a certain html-link every time someone writes a specified word like

youtube

becomes:

youtube (http://youtube.com)

[Dismounted]

<a href="https://vborg.vbsupport.ru/showthread.php?t=149118" target="_blank">Replacement Words In Posts</a>

[Problemsolver]

Doesnt work for later versions of vbulletin