A few months ago, I knew there was this addon but I wrote 'I know to do my regex myself, I don't think I need it". I was clearly mistaken. This addon is fantastic because it allows to make search & replace on XenForo Raw Code (<xen:..>). That was what I was asking about 1 year ago about how to create "Template_PRE_render" listener (see that thread:
www.xenforo.com/community/threads/18628). And there is even an option for developers to include the modifications inside their addons. This is a full product, it's great and the coding is amazing. Thank you so much Guiltar!