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-rw-r--r--qtmips_gui/fixmatheval.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/qtmips_gui/fixmatheval.cpp b/qtmips_gui/fixmatheval.cpp
index c06d892..8852938 100644
--- a/qtmips_gui/fixmatheval.cpp
+++ b/qtmips_gui/fixmatheval.cpp
@@ -199,7 +199,7 @@ bool FmeExpression::parse(const QString &expression, QString &error) {
QChar ch = 0;
if (i < expression.size())
ch = expression.at(i);
- if(!ch.isLetterOrNumber()|| (i >= expression.size())) {
+ if(!(ch.isLetterOrNumber() || (ch == '_')) || (i >= expression.size())) {
if (in_word) {
FmeNode *new_node = nullptr;
QString word = expression.mid(word_start, i - word_start);