Re^2: extract the value before a particualr string

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Re^3: extract the value before a particualr string by Random_Walk (Prior) on Sep 05, 2013 at 11:13 UTC
`$1` holds the result of the pattern match captured inside (parenthesis). If you had multiple parens then there would also be a `$2, $3, etc.` The $/ variable is the input record separator, this defaults to being a newline, so `print $_,$/` is equivalent to `print "$_\n"`. The $ after total tells the regex engine that total will be the last thing on the line. Cheers, R. Pereant, qui ante nos nostra dixerunt!	[reply] [d/l] [select]
Re^4: extract the value before a particualr string by Anonymous Monk on Sep 05, 2013 at 11:40 UTC
So, if we need to do the operation on a variable line and assign the output to a variable how do we go abt it??? `$count = $line if/\s+?(\d+?)\/total$/;` [download] will this look fine?	[reply] [d/l]
Re^5: extract the value before a particualr string by hdb (Monsignor) on Sep 05, 2013 at 11:49 UTC
No, that would be `$count = $1 if $line =~ /\s+?(\d+?)\/total$/;` [download]	[reply] [d/l]
Re^3: extract the value before a particualr string by 2teez (Vicar) on Sep 05, 2013 at 12:05 UTC
Random_Walk has given a good explanation. However, maybe the following line could help clear the that line a bit. `print $1,$/ if m{\s+?(\d+?)\/total$};` The above line shows clearly that after "total", what you have is "$" that indicate the end of the string and not "$/". The / that follows "$" is the second "slash" of the match operator i.e `m// ^ This one` [download] In addition to all that, using the module "YAPE::Regex::Explain" the regular expression matches could be explain as thus: The regular expression: (?-imsx:\s+?(\d+?)/total$) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- \s+? whitespace (\n, \r, \t, \f, and " ") (1 or more times (matching the least amount possible)) ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- \d+? digits (0-9) (1 or more times (matching the least amount possible)) ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- /total '/total' ---------------------------------------------------------------------- $ before an optional \n, and the end of the string ---------------------------------------------------------------------- ) end of grouping ---------------------------------------------------------------------- [download] If you tell me, I'll forget. If you show me, I'll remember. if you involve me, I'll understand. --- Author unknown to me	[reply] [d/l] [select]
Re^3: extract the value before a particualr string by marinersk (Priest) on Sep 05, 2013 at 12:56 UTC
I did try somethin like using split with multiple parameters but it extacts the whole line. I'm intrigued. Could you post the code that extacted the whole line?	[reply]