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    <p>Perl can easily serve as your friend in cases like this. You can read the entire file into memory to apply a regular expression over multiple lines. Setting the input record separator to <code>0777</code> causes such a "slurping" action. The <code>-n</code> switch simply says to read the file or files provided on the command-line. The <code>-e</code> switch's argument constitutes the code to execute.</p> <p>The regular expression's <code>/s</code> modifier allows <code>.</code> to match a newline. The <code>\m</code> modifier allows both <code>^</code> and <code>$</code> to match immediately before and after an embedded newline. These are key to parsing a string containing more than one logical line. The <code>/g</code> modifier, tells the regex engine to search globally for all matches.</p> <pre><code>perl -0777 -ne 'print "$1 $2\n" while m{^(\S+).+?\[age=(\d+)\]}gms' file </code></pre> <p>Given an input file like this:</p> <pre><code>01238584 (other info) more info, more info [age=81][otherinfo][etc, etc] 98765432 (still other info) still more info, and more info [age=82][and more otherinfo][etc, etc, ad infinitum] </code></pre> <p>...the script above outputs:</p> <pre><code>01238584 81 98765432 82 </code></pre> <p>We can dissect the regular expression thusly:</p> <pre><code>perl -MYAPE::Regex::Explain -e 'print YAPE::Regex::Explain-&gt;new(qr/m{^(\S+). </code></pre> <p>+?[age=(\d+)]}gms/)->explain()'</p> <pre><code>The regular expression: (?-imsx:m{^(\S+).+?\[age=(\d+)\]}gms) 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): ---------------------------------------------------------------------- m{ 'm{' ---------------------------------------------------------------------- ^ the beginning of the string ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- \S+ non-whitespace (all but \n, \r, \t, \f, and " ") (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- .+? any character except \n (1 or more times (matching the least amount possible)) ---------------------------------------------------------------------- \[ '[' ---------------------------------------------------------------------- age= 'age=' ---------------------------------------------------------------------- ( group and capture to \2: ---------------------------------------------------------------------- \d+ digits (0-9) (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ) end of \2 ---------------------------------------------------------------------- \] ']' ---------------------------------------------------------------------- }gms '}gms' ---------------------------------------------------------------------- ) end of grouping ---------------------------------------------------------------------- </code></pre>
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    1. POgrep, awk, bash and friends? any tool to munge this data?
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    1. USJRFerguson
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    1. CODespite loving awk and sed and python, I've *never* touched perl before, so this was fascinating! Impressed that you can do that in a relatively short 1-liner. Thanks for the explanation!
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    2. CODown-voter: Why the down-vote?
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    3. CO(I know right? Haters gonna hate, I guess. I up-voted it.)
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