http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/re_syntax.htm 


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Many threads in [the comp.lang.tcl newsgroup] have inspired
wonderful instances of RE explication.  [Michael A. Cleverly],
for example, wrote a delightful one
[http://groups.google.com/groups?q=re_syntax+group%3acomp.lang.tcl*&hl=en&lr=&ie=UTF-8&scoring=d&selm=Pine.LNX.4.33.0206232031300.3419-100000%40gibraltar.cleverly.com&rnum=2]
on "Extracting numbers from text strings, removing unwanted characters".
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