Trying to combine lookahead and variable substitution
I've tried this in a few different tools, but I think perl is what I want to use. I'm not too familiar with it so be gentle.
I'm trying to strip off characters from a single line of text. I want to end up with only the version of a package name from this:
"recommended : bzip2-program-1.0.3"
So I figured I would do a non-greedy search for a dash, then one or more digits since it could very well be:
"recommended : bzip2-program-10.0.3"
Then, look ahead to find the period, then use a place holder to hold the version up to another dash in case I have something like this:
"recommended : bzip2-program-1.0.3-12"
I want to end up with: "1.0.3"
Any suggestions would be much appreciated. If you have a suggestion to use another tool, I would love to hear it as well.
You could use a regular expression with perl
^.+- : match one or more caracter until the dash (included)
(\d+\.?\d+\.?\d+): match one digit or more followed by a dot or not, etc...
-? : match one dash or not
\d* : match zero or more digit
Note that it will remove the "-12" from "1.0.3-12", it is what you want if I understand correctly, no?
You use it like:
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