lookup_variable  1717 modules/mappers/mod_rewrite.c                     result = apr_pstrdup(r->pool, lookup_variable(var+5, ctx));
lookup_variable  1752 modules/mappers/mod_rewrite.c                     result = apr_pstrdup(r->pool, lookup_variable(var+5, ctx));
lookup_variable  2168 modules/mappers/mod_rewrite.c                 p = lookup_variable(apr_pstrmemdup(pool, p+2, endp-p-2), ctx);