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The substitution operator s has the form:
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$line =~ s/regex1/regex2/ ;
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As with m, the operator s can use any delimiter and so
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$line =~ s#regex1#regex2# ;
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is an equivalent form
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In the substitution s/regex1/regex2/g the /g causes substitution to occur at all possible places in string (normally only the first match is found)
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Note that /i and /g can be used together
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In an HTML doc, replace 2x2 with <NOBR>2 x 2 </NOBR>
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Search: (\d+)x(\d+)
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Replace: <NOBR>\1 x \2</NOBR>
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PERL: s|(\d+)x(\d+)|<NOBR>\1 x \2</NOBR>|i
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