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Old 02-28-2011, 05:41 PM   #16
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Registered: Feb 2011
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actually even with regex powerfull enough, grep shouldn't work
because to recognize the words you need to rely on the common part that is in the sides
but that is still part of the regex so it will be printed together with the word

grep is a finder not an editor, so is in the wrong category of programs for this

sed is an editor, and for this will be enough
it can also do the work of grep putting it on quiet with -n and printing only when there is a match with the p option in s program
cat file |sed -n 's/.*sourceid=\([^&]*\).*/\1/p'

so it's working even if there are mixed lines, if you have more rules for different kind of lines you can add them on sed

cat file |sed -n 's/.*sourceid=\([^&]*\).*/\1/p;s/side-left-match\(word-match\)side-right-match/\1/p'

info sed
for information on sed and regexp


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