jscript: Fixed parsing /=/ regexp.

dlls/jscript/lex.c

@@ -963,8 +963,7 @@ literal_t *parse_regexp(parser_ctx_t *ctx)
 
     TRACE("\n");
 
-    while(*ctx->ptr != '/')
-        ctx->ptr--;
+    while(*--ctx->ptr != '/');
 
     re = ++ctx->ptr;
     while(ctx->ptr < ctx->end && *ctx->ptr != '/') {

dlls/jscript/tests/regexp.js

@@ -580,4 +580,7 @@ ok(i === 1, "String.prototype.seatch.apply(obj, 'b') = " + i);
 i = " undefined ".search();
 ok(i === null, "' undefined '.search() = " + i);
 
+tmp = "=)".replace(/=/, "?");
+ok(tmp === "?)", "'=)'.replace(/=/, '?') = " + tmp);
+
 reportSuccess();