I want htaccess code for 301 redirection

old ad format -  xyz.com/for-sale/bike-for-sale_i123    but i am changed  underscore to hyphen format

now new ad format -  xyz.com/for-sale/bike-for-sale-i123   

In this case, my site all ads want 301 redirection & manual 5000+ ads not possible for each ad htaccess code

So, want dynamic htaccess 301 code for only work in i_    to i-   case   

I am trying but then all other pages wrongly redirected.

Any expert solution ....?

Must IMP forgotten point in Osclass.

I was doing that recently and simply autogenerated code using loop and put there to htaccess.
You need to do it just temporary for month or so.

Can you share htaccess code here ...?

I am using Redirect 301 /xyz.com/for-sale/bike-for-sale_i123 https://www.xyz.com/for-sale/bike-for-sale-i123

but each ad not possible. huge list

any loop code? so all ad auto work as per the new format.

@Ajit
Try this one.

    $mSearch = new Search() ;
    $mSearch->limit(0, 9999) ;
    $aItems = $mSearch->doSearch();
    View::newInstance()->_exportVariableToView('items', $aItems);

    if(osc_count_items() > 0) {
      while(osc_has_items()) {
        echo 'Redirect 301 ' . str_replace(osc_base_url(), '/', osc_item_url()) . ' ' . str_replace('_', '-', osc_item_url()) . '<br/>';
      }
    }

You generate this code before you change"_" into "-", save output to htaccess and immediatelly change permalink settings.

actually i am alreday changed permalink

and now some ad recrwal 404 bucz _     

How to do now ...?


if any old ad link found i_   then when click want auto redirect to i-                 like this  via htaccess

So, its help all old ads auto redirect and 404  gone   or recrwal 200- ok found.

While permalink setting i-    ON  case   how to do ...? Pls share working code.

Already shared working code.
You can customize it by your needs and preferences.

So, shared code where to add in function.php or htaccess ...?

@Ajit
PHP code probably belongs to .php file.

Code not clear -  error code

Code is correct, works ok for me.
I think you will need at least basic knowledge of PHP to be able to work with such code successfully.