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>
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>