> So I just read in the documentation:
>> [...] it is not possible to use a pattern that matches multiple  
>> lines. [...]

Not true  (if you are talking about find and replace searching).

Enable multiline searching using (?m)
 the pattern  "(?m)get.*Kend" will find one match in the following example text (hit cntrl-cmd-E to open this email in textmate and then select the pattern and hit cmd-E to try it out

Papers to get
    Newton Morton (Southhampton high IQ geneticist)
    Eaves et al. 2005
    Kendler (and Eaves?) 2005
        Extended phenotype


I like this help page for Oniguruma

http://www.jpsoft.com/help/index.htm?regularexpressionsyntax.htm


Other powerful underused options are:
    (?i) = ignore case (?#greatly simplifies reg ex for words where caps vary)
    (?# oh yes # allows comments – very handy when writing bundles you want to be more explanatory:-)