替代或删除指定的子串（相当于Replace的应用），以递归方式实现

函数定义： 

f_replace_string(String ls_old value ,String ls_replace readonly,String ls_with readonly)

程序源码如下： 

String ls_new 

Integer li_find 

li_find = Pos(ls_old, ls_replace) 

If li_find > 0 Then 

ls_new = Left(ls_old, li_find -1) + ls_with + Mid(ls_old, li_find + Len(ls_replace)) 

Return(f_replace_string(ls_new,ls_replace,ls_with)) 

Else 

Return(ls_old) 

End If

在函数中如要删除子串，第三个参数可为空串（""）

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