Regular Expressions

-Perl Reg Ex

-UNIX Reg ex

^ - begin line

$ - end line

. - any 1 character

? - 0 or 1 times

* - 0 or more times

+ - 1 or more times

| - OR

[ ] - set of characters

[^pattern] - not

{ } - repitition

Groupings

\d - digit

\w - word is alphe-numeric

\s - space

# netstat -npa --inet | sed 's/:/ /g' | grep -P '[0-9]+\.'

/i - case insensative

Perl uses '~' before regex

Print Only Filenames w/o Extensions

# ls -l | awk '{print $9}' | sed 's/\./ /g' | awk '{print $1}'

# ls -l | awk '{print $9}' | sed 's/\.[^\.]*$//g'

sed 's/-[^-]*-[^-]*$//'

replace anything that begins with - (but not --) and 0+ chars, follwed by -(but not --) followed by 0+ chars.

bash-3.0-19.7

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