english_customizable.xml:

<Item id="42059" name="Sort Lines Lexicographically Ascending"/>
<Item id="42060" name="Sort Lines Lexicographically Descending"/>

->

<Item id="42059" name="Sort Lines by Unicode values Ascending"/>
<Item id="42060" name="Sort Lines by Unicode values Descending"/>

=

:-)

Strictly speaking, The N++ sort feature is a sort of the Unicode code-points of characters !

Assuming, for instance, these few values, picked out, by hazard, from my Courrier New font, v2.90, that I sorted, alphabetically, by their Unicode official name

   ﯿ   U+FBFF   ARABIC LETTER FARSI YEH MEDIAL FORM
   ج   U+062C   ARABIC LETTER JEEM
   ق   U+0642   ARABIC LETTER QAF
   ♫   U+266B   BEAMED EIGHTH NOTES
   ♣   U+2663   BLACK CLUB SUIT
   ┼   U+253C   BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL
   	   U+0009   CHARACTER TABULATION 
   ̀   U+0300   COMBINING GRAVE ACCENT
   ©   U+00A9   COPYRIGHT SIGN
   Ќ   U+040C   CYRILLIC CAPITAL LETTER KJE
   к   U+043A   CYRILLIC SMALL LETTER KA
   2   U+0032   DIGIT TWO
   =   U+003D   EQUALS SIGN
   €   U+20AC   EURO SIGN
   ≥   U+2265   GREATER-THAN OR EQUAL TO
   Δ   U+0394   GREEK CAPITAL LETTER DELTA
   δ   U+03B4   GREEK SMALL LETTER DELTA
   א   U+05D0   HEBREW LETTER ALEF
   אָ   U+FB2F   HEBREW LETTER ALEF WITH QAMATS
   ר   U+05E8   HEBREW LETTER RESH
   Ă   U+0102   LATIN CAPITAL LETTER A WITH BREVE
   Ầ   U+1EA6   LATIN CAPITAL LETTER A WITH CIRCUMFLEX AND GRAVE
   É   U+00C9   LATIN CAPITAL LETTER E WITH ACUTE
   N   U+004E   LATIN CAPITAL LETTER N
   ă   U+0103   LATIN SMALL LETTER A WITH BREVE
   ầ   U+1EA7   LATIN SMALL LETTER A WITH CIRCUMFLEX AND GRAVE
   é   U+00E9   LATIN SMALL LETTER E WITH ACUTE
   n   U+006E   LATIN SMALL LETTER N
   ø   U+00F8   LATIN SMALL LETTER O WITH STROKE
   “   U+201C   LEFT DOUBLE QUOTATION MARK
   _   U+005F   LOW LINE
   ˉ   U+02C9   MODIFIER LETTER MACRON
   ×   U+00D7   MULTIPLICATION SIGN
      U+FFFC   OBJECT REPLACEMENT CHARACTER
   %   U+0025   PERCENT SIGN
   ”   U+201D   RIGHT DOUBLE QUOTATION MARK
   →   U+2192   RIGHTWARDS ARROW
       U+0020   SPACE
   √   U+221A   SQUARE ROOT
   ™   U+2122   TRADE MARK SIGN
   |   U+007C   VERTICAL LINE
   ½   U+00BD   VULGAR FRACTION ONE HALF
   ☺   U+263A   WHITE SMILING FACE
       U+FEFF   ZERO WIDTH NO-BREAK SPACE

If you use the option Edit > Line Operations > Sort Lines Lexicographically Ascending, this list becomes :

   	   U+0009   CHARACTER TABULATION 
       U+0020   SPACE
   %   U+0025   PERCENT SIGN
   2   U+0032   DIGIT TWO
   =   U+003D   EQUALS SIGN
   N   U+004E   LATIN CAPITAL LETTER N
   _   U+005F   LOW LINE
   n   U+006E   LATIN SMALL LETTER N
   |   U+007C   VERTICAL LINE
   ©   U+00A9   COPYRIGHT SIGN
   ½   U+00BD   VULGAR FRACTION ONE HALF
   É   U+00C9   LATIN CAPITAL LETTER E WITH ACUTE
   ×   U+00D7   MULTIPLICATION SIGN
   é   U+00E9   LATIN SMALL LETTER E WITH ACUTE
   ø   U+00F8   LATIN SMALL LETTER O WITH STROKE
   Ă   U+0102   LATIN CAPITAL LETTER A WITH BREVE
   ă   U+0103   LATIN SMALL LETTER A WITH BREVE
   ˉ   U+02C9   MODIFIER LETTER MACRON
   ̀   U+0300   COMBINING GRAVE ACCENT
   Δ   U+0394   GREEK CAPITAL LETTER DELTA
   δ   U+03B4   GREEK SMALL LETTER DELTA
   Ќ   U+040C   CYRILLIC CAPITAL LETTER KJE
   к   U+043A   CYRILLIC SMALL LETTER KA
   א   U+05D0   HEBREW LETTER ALEF
   ר   U+05E8   HEBREW LETTER RESH
   ج   U+062C   ARABIC LETTER JEEM
   ق   U+0642   ARABIC LETTER QAF
   Ầ   U+1EA6   LATIN CAPITAL LETTER A WITH CIRCUMFLEX AND GRAVE
   ầ   U+1EA7   LATIN SMALL LETTER A WITH CIRCUMFLEX AND GRAVE
   “   U+201C   LEFT DOUBLE QUOTATION MARK
   ”   U+201D   RIGHT DOUBLE QUOTATION MARK
   €   U+20AC   EURO SIGN
   ™   U+2122   TRADE MARK SIGN
   →   U+2192   RIGHTWARDS ARROW
   √   U+221A   SQUARE ROOT
   ≥   U+2265   GREATER-THAN OR EQUAL TO
   ┼   U+253C   BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL
   ☺   U+263A   WHITE SMILING FACE
   ♣   U+2663   BLACK CLUB SUIT
   ♫   U+266B   BEAMED EIGHTH NOTES
   אָ   U+FB2F   HEBREW LETTER ALEF WITH QAMATS
   ﯿ   U+FBFF   ARABIC LETTER FARSI YEH MEDIAL FORM
       U+FEFF   ZERO WIDTH NO-BREAK SPACE
      U+FFFC   OBJECT REPLACEMENT CHARACTER

And it’s obvious that it’s sorted, according to the U+#### value of each character ! So, the correct formulation should be Sort Lines by Unicode values Ascending /Descending :-D

BTW, It would be nice if we could sort, according to our local language. For instance, this original list of some French words, below :

ère
école
bateau
euro
colis
eau
ferme
élu
à
emploi
lit
embarras
émoi
zoo
elle
errer
avion
été
sceau
ébène

is, presently, sorted as :

avion
bateau
colis
eau
elle
embarras
emploi
errer
euro
ferme
lit
sceau
zoo
à
ère
ébène
école
élu
émoi
été

However, the correct order, in a French dictionary, is :

à
avion
bateau
colis
eau
ébène
école
elle
élu
embarras
émoi
emploi
ère
errer
été
euro
ferme
lit
sceau
zoo

In the same way, the regex expression (?-i)[e-f] should match, for instance, the lower-case letters e and f and all Latin accentuated forms of the letter e. In other words, it should be equivalent to the regex (?-i)[eèéêëēĕėęěẹẻẽếềểễệ℮f], if I consider, simply, the Courier New font !

Best Regards,

guy038