take into account scientific notation of floats in regex_replace

this fixes occasional main.cte_recursive failures

Author: vuvova

mysql-test/t/cte_recursive.test

@@ -1510,7 +1510,7 @@ drop table t1;
 --echo # MDEV-10773: ANALYZE for query with recursive CTE
 --echo #
 
---replace_regex /"r_total_time_ms": [0-9]*[.]?[0-9]*/"r_total_time_ms": "REPLACED"/
+--replace_regex /"r_total_time_ms": [0-9]*[.]?[0-9]*(e[-+]?[0-9]+)?/"r_total_time_ms": "REPLACED"/
 analyze format=json 
 with recursive src(counter) as 
 (select 1