1 files changed, 6 insertions, 0 deletions
diff --git a/grammar.txt b/grammar.txt
new file mode 100644
index 0000000..f2a7827
--- /dev/null
+++ b/grammar.txt
@@ -0,0 +1,6 @@
+regex     := alternate (PIPE alternate)*
+alternate := node*
+node      := csetnode | grouping
+csetnode  := TILDE? (CHARSET | union) STAR?
+union     := LEFT_BRACKET CHARSET* RIGHT_BRACKET
+grouping  := LEFT_PAREN regex RIGHT_PAREN