Fix infinite loop

1 files changed, 13 insertions, 3 deletions

diff --git a/src/js_ast.zig b/src/js_ast.zig
index f3d941251..452f6044c 100644
--- a/src/js_ast.zig
+++ b/src/js_ast.zig
@@ -1853,11 +1853,21 @@ pub const E = struct {
             var pat = this.pattern();
             while (pat.len > 0) {
                 const start = strings.indexOfChar(pat, '?') orelse return false;
-                if (start == 0) return false;
+                if (start == 0) {
+                    pat = pat[1..];
+                    continue;
+                }
                 const l_paren = pat[start - 1];
-                if (l_paren != '(' or pat.len < start + 1) return false;
+                if (start > 1 and pat[start - 2] == '\\') {
+                    pat = pat[start..];
+                    continue;
+                }
+                if (l_paren != '(' or pat.len < start + 1) {
+                    pat = pat[start..];
+                    continue;
+                }
                 const op = pat[start + 1];
-                if (op == '<' or op == '=' or op == '!') {
+                if (op == '<') {
                     return true;
                 }
                 pat = pat[start + 1 ..];