I graduated in 1990 in Electrical Engineering and since then I have been in university, doing research in the field of DSP. To me programming is more a tool than a job.
Tools? None, most of the times.
For most complex regex, I wrote myself a nice "regexp generator" library that allows me to "build" regexp in more readable way.
Problems? It depends on the language, actually. In Ruby I use them mostly to parse simple line-based text files. In Ada I use them more sparingly, usually when I need some kind of lexical analyzer. The reason for this difference is that in Ruby using regexp is much easier: just write something like /[a-z][0-9]+/, in Ada it is a bit more involved.
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/[a-z][0-9]+/, in Ada it is a bit more involved.