Add :xyz: replacement syntax that removes whatever is before it and inserts whatever is inside it

1 files changed, 13 insertions, 0 deletions

diff --git a/subex/subexast.go b/subex/subexast.go
index ee7a959..dd98aa9 100644
--- a/subex/subexast.go
+++ b/subex/subexast.go
@@ -359,3 +359,16 @@ func (ast SubexASTEmpty) compileWith(next SubexState) SubexState {
 func (ast SubexASTEmpty) String() string {
 	return "()"
 }
+
+// Discards the output from the content subex
+type SubexASTDiscard struct {
+	Content SubexAST
+}
+func (ast SubexASTDiscard) compileWith(next SubexState) SubexState {
+	return &SubexCaptureBeginState {
+		next: ast.Content.compileWith(&SubexDiscardState {next}),
+	}
+}
+func (ast SubexASTDiscard) String() string {
+	return fmt.Sprintf("(%v)$_", ast.Content)
+}