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Warning: those guides are mostly obsolete, please have a look at the new documentation.

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regex and sed examples
 
 
Zero to one time low characters,
[a-z]\{0,1\}
 
One or more time low characters,
[a-z]\{1,\}
 
Anything but a dash,
[^-]
 
Remove UNIX comments,
  sed -e '
    /^#/d;
    /^$/d;
    /^ *#/d;
    /^  *#/d;
    '
Note. with GNU sed you can use '[[:space:]] instead of the space and tab lines,
sed '/^[::space::]*#/d; /^$/d;' httpd.conf.dist > httpd.conf
 
Remove PHP comments,
sed '/\/\*/,/*\//d; /^\/\//d; /^$/d;'
 
To convert URLs to HTML links,
s|http: //\([a-zA-Z0-9.\,:\/?\&=~%+_#-]*\)|<a href=\"http: //\1\">\1</a>|g;
s|https: //\([a-zA-Z0-9.\,:\/?\&=~%+_#-]*\)|<a href=\"https: //\1\">\1</a>|g;
s|ftp: //\([a-zA-Z0-9.\,:\/?=\&~%+_#-]*\)|<a href=\"ftp: //\1\">\1</a>|g;
 
Print first line until "match" gets reached,
sed -n '1,/match/p'
print from "match" until the end of file gets reached,
sed -n '/match/,$p'
 
Print lines matching both match1 and match2 in the same line,
sed -ne /match1/{/match2/p;}
print the lines machine either match1 or match2,
grep -E 'match1|match2'
 
 
References
http://www.gnu.org/software/sed/manual/html_node/Regular-Expressions.html
http://sed.sourceforge.net/sed1line.txt
http://sed.sourceforge.net/sedfaq.html
http://www.gnu.org/software/sed/manual/sed.html
http://www.grymoire.com/Unix/Sed.html#uh-0
http://bash-hackers.org/wiki/doku.php?id=howto:edit-ed
http://www.epons.org/sed.php
 

(obsolete, see the new doc)