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    <p>So match the first three numbers explicitly, and drop everything else.</p> <pre><code>s/^([\dE.]+)\s+([\dE.]+)\s+([\dE.]+).*$/$1 $2 $3/; </code></pre> <p>This works as follows:</p> <pre><code>$ perl -MYAPE::Regex::Explain -E 'say YAPE::Regex::Explain-&gt;new(q{^([\dE.]+)\s+([\dE.]+)\s+([\dE.]+).*$})-&gt;explain;' The regular expression: (?-imsx:^([\dE.]+)\s+([\dE.]+)\s+([\dE.]+).*$) 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): ---------------------------------------------------------------------- ^ the beginning of the string ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- [\dE.]+ any character of: digits (0-9), 'E', '.' (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- \s+ whitespace (\n, \r, \t, \f, and " ") (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ( group and capture to \2: ---------------------------------------------------------------------- [\dE.]+ any character of: digits (0-9), 'E', '.' (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ) end of \2 ---------------------------------------------------------------------- \s+ whitespace (\n, \r, \t, \f, and " ") (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ( group and capture to \3: ---------------------------------------------------------------------- [\dE.]+ any character of: digits (0-9), 'E', '.' (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ) end of \3 ---------------------------------------------------------------------- .* any character except \n (0 or more times (matching the most amount possible)) ---------------------------------------------------------------------- $ before an optional \n, and the end of the string ---------------------------------------------------------------------- ) end of grouping ---------------------------------------------------------------------- </code></pre> <p>(Updated in consideration of the changes the OP made to the original specification.)</p>
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    1. POPerl, delete everything after first three characters
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    1. CO`/[^\d]*((\d+\s+){3}).+/`
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    2. COThis fails as currently written on negative numbers and on negative exponents.
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    3. COI don't see where the OP mentioned the possibility of negative exponents or negative numbers. But you are correct. At some point it becomes advantageous to just use Regexp::Common to employ a community-tested solution.
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