ctRegex vs. Regex vs. plain string

[Chris]

I have updated my code (finally!) to 2.060. As my project deals a 
lot with text processing including loads of special characters 
(á, ú etc.), I make extensive use of the std.regex module (and I 
really appreciate the use of the Thompson NFA). To optimize my 
program I have experimented with ctRegex / StaticRegex and Regex. 
However, there are still compile time problems with Regex and 
StaticRegex which is why I am using plain strings at the moment, 
which work fine with the same regular expressions. Are there any 
precautions I have to take when using compile time regular 
expressions? Does anyone have any experience as regards 
performance enhancement?