Acount for all non-negative spaces used by lyx

The unicode representation in an ascii-string string is
\302\240                                Normal space
\342\200\257                            Non-breaking Thin (1/6 em)
\342\200\213\342\200\205\342\200\213    Medium(2/9 em)
\342\200\213\342\200\204\342\200\213    Thick (5/18 em)
\342\201\240\342\200\202\342\201\240    Half Quad(0.5 em)
\342\200\203                            Quad(1 em)
\342\200\203\342\200\203                Double Quad(2 em)
\342\220\243                            Visible space

'Double Quad' counts as 2 spaces, all others count as 1 space in the search regex

src/lyxfind.cpp

@@ -831,13 +831,47 @@ string string2regex(string in)
 			// normal blanks
 			blanks++;
 		}
-		else if ((tempx[i] == '\302' && tempx[i+1] == '\240')
+		else if (tempx[i] == '\302' && tempx[i+1] == '\240') {
-			|| (tempx[i] == '\342' && tempx[i+1] == '\202')) {
+			// Normal Space
-			// protected space
-			// thin space
 			blanks++;
 			i++;
 		}
+		else if (tempx[i] == '\342') {
+			if (tempx[i+1] == '\200') {
+				if ((tempx[i+2] == '\257')
+				   || (tempx[i+2] == '\203')
+				   || (tempx[i+2] == '\202')) {
+					// Non-breaking Thin (1/6 em)
+					// Quad(1 em), (Double quad counts as 2 blanks)
+					// Half Quad
+					blanks++;
+					i += 2;
+				}
+				else if (tempx[i+2] == '\213') {
+					// Ignoring parts of Medium and Thick
+					i += 2;
+					continue;
+				}
+				else if ((tempx[i+2] == '\204') || (tempx[i+2] == '\205')) {
+					// Thick
+					// Medium
+					blanks++;
+					i += 2;
+				}
+			}
+			else if (tempx[i+1] == '\201') {
+				if (tempx[i+2] == '\240') {
+					// Ignoring parts of half quad
+					i += 2;
+					continue;
+				}
+			}
+			else if ((tempx[i+1] == '\220') && (tempx[i+2] == '\243')) {
+				// Visible space
+				blanks++;
+				i += 2;
+			}
+		}
 		else {
 			if (blanks > 0) {
 				temp += getRegexSpaceCount(blanks);