This is quick and dirty, but it should do. At least it does in the test case. Whether it's hand-edited or machine-generated, I think it's safe to assume that we have no CR within a given formatting statement and each and every reference to 'Arial' will be in the context of font formatting (you are not usin this on a tipographer's site, right?)

This is the code: 

use strict;

while (<DATA>) {
    s/font-size:\s*10pt/font-size: 18pt/i;
    s/Times New Roman/Helvetica/i;
    print $_;
}

__DATA__
body {
    text-decoration: none;
    text-indent: 0in;
    text-align: left;
    lang: en-US;
    font-weight: normal;
    font-variant: normal;
    color: #000000;
    font-size: 10pt;
    font-style: normal;
    widows: 2;
    font-family: 'Times New Roman';
} 

   <p dir="ltr" style="text-align: justify"><span style="font-weight: 
+bold; lang: en-US; font-size: 11pt; font-family: 'Arial'">Consultancy
+</span></p>

[download]
This prints out: 
body {
    text-decoration: none;
    text-indent: 0in;
    text-align: left;
    lang: en-US;
    font-weight: normal;
    font-variant: normal;
    color: #000000;
    font-size: 18pt;
    font-style: normal;
    widows: 2;
    font-family: 'Helvetica';
}

   <p dir="ltr" style="text-align: justify"><span style="font-weight: 
+bold; lang
: en-US; font-size: 11pt; font-family: 'Arial'">Consultancy</span></p>

[download]

In reply to Re: Perl Replace Help by l3nz
in thread Perl Replace Help by Anonymous Monk

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.