Use ${1} instead of \1:     s/(\d+ *)L\-homoserine/${1}2\-Amino\-4\-hydroxybutyric\ acid/;

It is best not to use \1 on the right hand side of a s///. See also "Warning on \1 vs $1" in perlre.

You can omit the escapes to make it a little cleaner:     s/(\d+ *)L-homoserine/${1}2-Amino-4-hydroxybutyric acid/;

Also, the match doesn't work for cases with no leading number (you seem to suggest that this is possible). Therefore, something like this might be better:     s/(\d*\s*)L-homoserine/${1}2-Amino-4-hydroxybutyric acid/;

--
John.

In reply to Re: Regular expressions Containing Octal values? by jmcnamara
in thread Regular expressions Containing Octal values? by arunhorne

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.