Find And Replace in Ms word using Vb.net

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VB

Visual-Studio

VS2010

MS-Word

I'm Working on Find and Replace Ms word using visual studio 2010 with Vb.net, For example i'm
findinga word Alumina C(Gamma) Gel.

Here Gamma is Character code ie, Alt+0947.I'm using Regexp for this

\b([Aa]lumina\s?\-?[Cc]ChrW(0947)\s?\-?[Gg]el)\b

My problem is if i type a word Alumina C(Gamma) Gel then my Regexp is working , if i Copy and paste a word

then my Regexp is not working. I think my problem is (Gamma) ie,Alt+0947.It could not be found when

i'm Copy and paste.

Experts,Suggest me to get a solution.

Thanks in advance.