Some texts contain weird SGML entities: ] \ etc. I found out that these are ISONUM entities. Here is a hash that maps the names to the unicode characters, extracted from the table linked above. It is ready to be used in the HTML::Entities::_decode_entities function.
{
    'amp' => chr(0x00026),
    'amp;' => chr(0x00026),
    'apos' => chr(0x00027),
    'apos;' => chr(0x00027),
    'ast' => chr(0x0002A),
    'ast;' => chr(0x0002A),
    'brvbar' => chr(0x000A6),
    'brvbar;' => chr(0x000A6),
    'bsol' => chr(0x0005C),
    'bsol;' => chr(0x0005C),
    'cent' => chr(0x000A2),
    'cent;' => chr(0x000A2),
    'colon' => chr(0x0003A),
    'colon;' => chr(0x0003A),
    'comma' => chr(0x0002C),
    'comma;' => chr(0x0002C),
    'commat' => chr(0x00040),
    'commat;' => chr(0x00040),
    'copy' => chr(0x000A9),
    'copy;' => chr(0x000A9),
    'curren' => chr(0x000A4),
    'curren;' => chr(0x000A4),
    'darr' => chr(0x02193),
    'darr;' => chr(0x02193),
    'deg' => chr(0x000B0),
    'deg;' => chr(0x000B0),
    'divide' => chr(0x000F7),
    'divide;' => chr(0x000F7),
    'dollar' => chr(0x00024),
    'dollar;' => chr(0x00024),
    'equals' => chr(0x0003D),
    'equals;' => chr(0x0003D),
    'excl' => chr(0x00021),
    'excl;' => chr(0x00021),
    'frac12' => chr(0x000BD),
    'frac12;' => chr(0x000BD),
    'frac14' => chr(0x000BC),
    'frac14;' => chr(0x000BC),
    'frac18' => chr(0x0215B),
    'frac18;' => chr(0x0215B),
    'frac34' => chr(0x000BE),
    'frac34;' => chr(0x000BE),
    'frac38' => chr(0x0215C),
    'frac38;' => chr(0x0215C),
    'frac58' => chr(0x0215D),
    'frac58;' => chr(0x0215D),
    'frac78' => chr(0x0215E),
    'frac78;' => chr(0x0215E),
    'gt' => chr(0x0003E),
    'gt;' => chr(0x0003E),
    'half' => chr(0x000BD),
    'half;' => chr(0x000BD),
    'horbar' => chr(0x02015),
    'horbar;' => chr(0x02015),
    'hyphen' => chr(0x02010),
    'hyphen;' => chr(0x02010),
    'iexcl' => chr(0x000A1),
    'iexcl;' => chr(0x000A1),
    'iquest' => chr(0x000BF),
    'iquest;' => chr(0x000BF),
    'laquo' => chr(0x000AB),
    'laquo;' => chr(0x000AB),
    'larr' => chr(0x02190),
    'larr;' => chr(0x02190),
    'lcub' => chr(0x0007B),
    'lcub;' => chr(0x0007B),
    'ldquo' => chr(0x0201C),
    'ldquo;' => chr(0x0201C),
    'lowbar' => chr(0x0005F),
    'lowbar;' => chr(0x0005F),
    'lpar' => chr(0x00028),
    'lpar;' => chr(0x00028),
    'lsqb' => chr(0x0005B),
    'lsqb;' => chr(0x0005B),
    'lsquo' => chr(0x02018),
    'lsquo;' => chr(0x02018),
    'lt' => chr(0x0003C),
    'lt;' => chr(0x0003C),
    'micro' => chr(0x000B5),
    'micro;' => chr(0x000B5),
    'middot' => chr(0x000B7),
    'middot;' => chr(0x000B7),
    'nbsp' => chr(0x000A0),
    'nbsp;' => chr(0x000A0),
    'not' => chr(0x000AC),
    'not;' => chr(0x000AC),
    'num' => chr(0x00023),
    'num;' => chr(0x00023),
    'ohm' => chr(0x02126),
    'ohm;' => chr(0x02126),
    'ordf' => chr(0x000AA),
    'ordf;' => chr(0x000AA),
    'ordm' => chr(0x000BA),
    'ordm;' => chr(0x000BA),
    'para' => chr(0x000B6),
    'para;' => chr(0x000B6),
    'percnt' => chr(0x00025),
    'percnt;' => chr(0x00025),
    'period' => chr(0x0002E),
    'period;' => chr(0x0002E),
    'plus' => chr(0x0002B),
    'plus;' => chr(0x0002B),
    'plusmn' => chr(0x000B1),
    'plusmn;' => chr(0x000B1),
    'pound' => chr(0x000A3),
    'pound;' => chr(0x000A3),
    'quest' => chr(0x0003F),
    'quest;' => chr(0x0003F),
    'quot' => chr(0x00022),
    'quot;' => chr(0x00022),
    'raquo' => chr(0x000BB),
    'raquo;' => chr(0x000BB),
    'rarr' => chr(0x02192),
    'rarr;' => chr(0x02192),
    'rcub' => chr(0x0007D),
    'rcub;' => chr(0x0007D),
    'rdquo' => chr(0x0201D),
    'rdquo;' => chr(0x0201D),
    'reg' => chr(0x000AE),
    'reg;' => chr(0x000AE),
    'rpar' => chr(0x00029),
    'rpar;' => chr(0x00029),
    'rsqb' => chr(0x0005D),
    'rsqb;' => chr(0x0005D),
    'rsquo' => chr(0x02019),
    'rsquo;' => chr(0x02019),
    'sect' => chr(0x000A7),
    'sect;' => chr(0x000A7),
    'semi' => chr(0x0003B),
    'semi;' => chr(0x0003B),
    'shy' => chr(0x000AD),
    'shy;' => chr(0x000AD),
    'sol' => chr(0x0002F),
    'sol;' => chr(0x0002F),
    'sung' => chr(0x0266A),
    'sung;' => chr(0x0266A),
    'sup1' => chr(0x000B9),
    'sup1;' => chr(0x000B9),
    'sup2' => chr(0x000B2),
    'sup2;' => chr(0x000B2),
    'sup3' => chr(0x000B3),
    'sup3;' => chr(0x000B3),
    'times' => chr(0x000D7),
    'times;' => chr(0x000D7),
    'trade' => chr(0x02122),
    'trade;' => chr(0x02122),
    'uarr' => chr(0x02191),
    'uarr;' => chr(0x02191),
    'verbar' => chr(0x0007C),
    'verbar;' => chr(0x0007C),
    'yen' => chr(0x000A5),
    'yen;' => chr(0x000A5),
}

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In reply to ISONUM Entities by Sixtease

Title:
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