diff --git a/uppsrc/Core/StrUtil.cpp b/uppsrc/Core/StrUtil.cpp
index e1db77291..81e29d611 100644
--- a/uppsrc/Core/StrUtil.cpp
+++ b/uppsrc/Core/StrUtil.cpp
@@ -58,6 +58,11 @@ int CharFilterWhitespace(int c)
 	return IsSpace(c) ? c : 0;
 }
 
+int CharFilterNotWhitespace(int c)
+{
+	return IsSpace(c) ? 0 : c;
+}
+
 int CharFilterAlpha(int c)
 {
 	return IsAlpha(c) ? c : 0;
diff --git a/uppsrc/Core/String.h b/uppsrc/Core/String.h
index 78c23d028..f3e600302 100644
--- a/uppsrc/Core/String.h
+++ b/uppsrc/Core/String.h
@@ -771,6 +771,7 @@ int CharFilterAscii128(int c);
 int CharFilterUnicode(int c);
 int CharFilterDigit(int c);
 int CharFilterWhitespace(int c);
+int CharFilterNotWhitespace(int c);
 int CharFilterAlpha(int c);
 int CharFilterAlphaToUpper(int c);
 int CharFilterAlphaToLower(int c);