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copied!<p>One way, also according with who says that regexp is not the tool for the job:</p> <p>Content of <code>script.pl</code> (with the regexp inside and explained):</p> <pre><code>use warnings; use strict; while ( <DATA> ) { printf qq[Text matched: %s\t (original string: %s)\n], $1, $& if m/ # At begin of line, '<' character plus optional space. \A < \s* # Literal 'font' word. font # Mandatory space. \s+ # Positive look-ahead for string 'size=5' (?= .* size \s* = \s* 5 (?:\s+|>) ) # Positive look-ahead for string 'face="verdana"' (?= .* face \s* = \s* "verdana" (?:\s+|>) ) # Positive look-ahead for string 'color="red"' (?= .* color \s* = \s* "red" (?:\s+|>) ) # If last three look-ahead succeed, match them. (?:size\s*=\s*5\s*|color\s*=\s*"red"\s*|face\s*=\s*"verdana"\s*){3} # Literal '>' character. > # Text between tags. ([^>]+) # Close tag and match end of string. <\/font> \Z /x; } __DATA__ <font size=5 color="red" face="verdana">randomtext</font> <font size=5 face="verdana" color="red">randomtext</font> <font color="red" size=5 face="verdana">randomtext</font> <font color="red" face="verdana" size=5>randomtext</font> <font face="verdana" size=5 color="red">randomtext</font> <font face="verdana" color="red" size=5>randomtext</font> <font size=5 size=5 size=5>randomtext</font> <font face="verdana" color="red" size=5 foobar="random">randomtext</font> <font face="verdana" color="red" size=5 foobar="random=pippo">randomtext</font> <font face="verdana" color="red" size=5 garbagetext>randomtext</font> </code></pre> <p>Run it like:</p> <pre><code>perl script.pl </code></pre> <p>With following result:</p> <pre><code>Text matched: randomtext (original string: <font size=5 color="red" face="verdana">randomtext</font>) Text matched: randomtext (original string: <font size=5 face="verdana" color="red">randomtext</font>) Text matched: randomtext (original string: <font color="red" size=5 face="verdana">randomtext</font>) Text matched: randomtext (original string: <font color="red" face="verdana" size=5>randomtext</font>) Text matched: randomtext (original string: <font face="verdana" size=5 color="red">randomtext</font>) Text matched: randomtext (original string: <font face="verdana" color="red" size=5>randomtext</font>) </code></pre>

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