[Help] auto replace content when post

[Thangvip9x]

I want auto replace when edit post, thread title, private message title
Because i try but your plugin don't replace
Thank you very much

--------------- Added [DATE]1391773031[/DATE] at [TIME]1391773031[/TIME] ---------------

This is my query
[SQL]UPDATE post SET pagetext = REPLACE(pagetext, 'a', 'b');
UPDATE post SET pagetext = REPLACE(pagetext, 'e', 'f');[/SQL]
I want you help me write query replace all a, b, c, d to e, f, g, h with one click when run SQL, because i have 100 character replace, thank you very much

--------------- Added [DATE]1391773120[/DATE] at [TIME]1391773120[/TIME] ---------------

Please help me write plugin auto replace when edit post, edit thread title, private message title, thank you very much