RegExp and Filter Content

Here is the thing. I need to add support for some special codes in th blogs posts, which do not support the shortcode format. For example a code can look like this [link=]

To solve this I wrote a plugin that filters 'the_content' and runs 15 RegExp checks, replacing the codes.

Basically I just want an opinion if this is a good implementation. Is RegExp fast enough or will this bog down the server?