Replace anchor tags with square bracket format

For reason I won't go into, I have just found myself needing to replace a lot of anchor tags with square bracket format anchor tags, like so:

// from <a href="#">link</a> // to [a href="#"]link[/a] 

Obviously, we need to use RegEx here, and for future reference mainly for myself, here are the matching and replacing patterns:

// match <a .*?href=['""](.+?)['""].*?>(.+?)</a> // replace [a href="$1"]$2[/a] 

May as well put in the reverse as well:

// match \[a .*?href=['""](.+?)['""].*?\](.+?)\[/a\] // replace <a href="$1">$2</a> 

And then if you're doing this in C#, just use this method:

string Regex.Replace(string input, string match, string replace) 

There we go, saved myself about a year of tedious work!