I am working on Android App that uses MUPDF reader to read pdf files, these pdf files contain Arabic letters and I want to use the search inside the mupdf to search for these Arabic letters, it only can find one letter but not a complete word, I tried to know if mupdf reads using ascii but I couldn't, so is there any methodology to make the mupdf finds whole Arabic words?

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I was using Mupdf version 1.2, it was not supporting LTR and RTL but after I have downloaded version 1.3 which was released in 15-8 I can now write any Arabic word in reversed order and the Mupdf will finds it. you can find the latest version here: http://www.mupdf.com/download/

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Left-to-right and right-to-left searching ought to work, if it doesn't then I suggest you open a bug report at bugs.ghostscript.com and attach a file where the search doesn't work. The simplest file you can manage would be appreciated.