diff --git a/crates/testing-framework/src/transform/parser.rs b/crates/testing-framework/src/transform/parser.rs
index 5b51457b..981e6482 100644
--- a/crates/testing-framework/src/transform/parser.rs
+++ b/crates/testing-framework/src/transform/parser.rs
@@ -125,7 +125,10 @@ fn parse_sexp_symbol(inp: Input<'_>) -> IResult<Input<'_>, Sexp, ParseError<'_>>
     map(
         recognize(pair(
             many1_count(alt((value((), alphanumeric1), value((), one_of("_-.$#%"))))),
-            opt(delimited(tag("["), parse_sexp_symbol, tag("]"))),
+            opt(terminated(
+                delimited(tag("["), parse_sexp_symbol, tag("]")),
+                opt(tag("!")),
+            )),
         )),
         Sexp::symbol,
     )(inp)
@@ -333,6 +336,12 @@ mod tests {
         assert_eq!(res, Ok(Sexp::symbol("sym_bol.$.blabla")));
     }
 
+    #[test]
+    fn test_symbol_lambda_exclamation() {
+        let res = Sexp::from_str("pid-num.$.[0]!");
+        assert_eq!(res, Ok(Sexp::symbol("pid-num.$.[0]!")));
+    }
+
     #[test]
     fn test_symbol_stream() {
         let res = Sexp::from_str("$stream");