Sorry, @ajit-nayak, as an European man I’m not acquainted, of course, with Indian languages !

However, I’m pretty sure that your problem is related to the current fonts, installed in your OS and not related to Notepad++

Presently, on my OS ( an old XP SP3 laptop ) I’ve got the following typefaces, relative to Indian languages and scripts :

•-------------•---------------•----------------------------•
|  Typeface   |   Font Name   |  Target Language / Script  |
•-------------•---------------•----------------------------•
|  gautami    |  gautami.ttf  |  Telugu language           |
|  MV Boli    |  mvboli.ttf   |  Thaana writing system     |
|  Raavi.ttf  |  raavi.ttf    |  Gurmukhi abugida          |
|  Shruti     |  shruti.ttf   |  Gujarati language         |
|  Tunga      |  tunga.ttf    |  Kannada script            |
|  Vrinda     |  vrinda.ttf   |  Bengali language          |
•-------------•---------------•----------------------------•

Refer to this link for an oversight of all the typefaces on Windows systems :

https://en.wikipedia.org/wiki/List_of_typefaces_included_with_Microsoft_Windows

From this list, I did not have any font for the Odia language ( formerly spelled as Oriya )

Refer to the link below, which explicits all Odia Unicode characters :

http://www.unicode.org/charts/PDF/U0B00.pdf

Luckily, after some researches on Google, I came across this site   http://odiafonts.com/

So, follow these steps :

• Close any Notepad++ instance, first

• Download the archive ananta.zip :    http://odiafonts.com/d/13058/ananta.zip

• Extract the OR51_Ananta.ttf font file

• Double-click on the OR51_Ananta.ttf file ( before installing this font, definitively, on your system ! )

• Re-start Notepad++ :

• Select the Settings > Style Configurator... > Global Styles > Global override style

• Then, in the Font Style section, choose the Odia Ananta font

• Tick the Enable global font option

• Click on the Save & Close button

With this font , containing 755 characters and 1245 glyphs, all the Unicode Odia characters are correctly displayed, except for the character \x{0B55} ( ORIYA SIGN OVERLINE ) !?

And I was able to get your composed characters, shown in your post. For instance :

• Concerning your first example :

  • \x{0B15} => କ
  • କ + \x{0B4D} => କ୍
  • କ୍ + \x{0B30} => କ୍ର
  • କ୍ର + \x{0B41} => କ୍ରୁ

• Concerning your second example :

  • \x{0B38} => ସ
  • ସ + \x{0B4D} => ସ୍
  • ସ୍ + \x{0B2E} => ସ୍ମ
  • ସ୍ମ + \x{0B43} => ସ୍ମୃ

To end with, here is an example of a regex S/R which change the latin letters A and Z, whatever their case, into your two characters :

• SEARCH (?i)(A)|(Z)

• REPLACE (?1\x{0B15}\x{0B4D}\x{0B30}\x{0B41})(?2\x{0B38}\x{0B4D}\x{0B2E}\x{0B43})

So from the simple line

A - Z

You would get :

କ୍ରୁ - ସ୍ମୃ

I hope I’m not too “off-topic” !

Best Regards,

guy038

P.S. :

Of course, the real glyph of composed Odia characters, resulting of the four consecutive characters, can ONLY be seen is you open this text, using the OR51_Ananta.ttf font file :-))

Ah ! Here is a picture of my file :

Have you tried setting driectwrite?