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Using both literals and variables in regexp
Posted by tclnewbee (tclnewbee), 19 July 2004
Hi,
Lets say :
set str "sgh 567"
I'm able to find patterns using regexp as below:
regexp -indices {[[:space:]]} $str res
and i'm also able to find like:
set ptr 567
regexp -indices "$ptr" $str res
But I want a mixture of both, something like:
regexp -indices {[[:space:]]*("$ptr")}
how do I combine the two.
Thanks. I really need it urgently.
Posted by admin (Graham Ellis), 19 July 2004
You need to double quote the regular expression and not enclose it in { and } - since variables starting with $ are expanded withing " and " but not within { and }.Then you need to backslash protect other special characters such as [ and ] as they are going to be performed in double quotes.
Here's an example of the sort of thing you might end up with:
regexp "\[\[:space\]\]$demo" $incoming
Look in $incoming for a space followed by whatever's in $demo
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Using both literals and variables in regexp
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