I am reading a file and finding all instances of a certain word.

What I would like to do is:

1) The first time I see the word I want to footnote it.
2) Any additional instance of the same word should be underlined.

How can I do this in a Regular Expression using the substitution operator ?

The line below will create a footnote for the first instance of the word gregarious:

$line =~ s/gregarious/\\footnote\{gregarious\}/im;

[download]

If the word appears again in the file, I would like it to underline it:

$line =~ s/gregarious/\\underline\{gregarious\}/;

[download]

Is there a way to combine these two statements and have the first instance of the word formatted differently from the others?

In reply to Combining two Reg Expressions with substitution by cranberry13

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.