# How to use Beyond Compare to confirm 100% replacement

Situation: It is easy to imagine having a pair of folders where every instance of path="**development**/js/magister.js"  was supposed to have been replaced with path="**production**/js/magister.js".  We want to inspect to confirm that all of the replacements actually occurred. 

Or in generic terms, you want to view the text in two files to confirm APPLE in File 1 was reliably replaced with ORANGE in File 2.

The solution in Beyond Compare is to first, make a replacement rule.  Then, make a grammar rule for a Beyond Compare File Format.

Step 1: At first the file looks like this.  Because the second file is meant for production, every path has been changed to say production.  The problem is, Lines 1, 3, 4, 5 should show up as beige and Line 2 should show up red, because it is the only bad line.

![](/files/-LnYTu6uvPCx1_5_Lwpq)

Step 2: In the Beyond Compare menu go to `Tools->Replacements`. 

![](/files/-LnYTyGhm3wmOgShbxqy)

Step 3: In the Beyond menu `Tools->FileFormats`

![](/files/-LnYUSsa1bJmxLUFkeoT)

Step 4: From now on, whenever you want to compare two files, use the dropdown to force your new format on the right pane only. And we see Line 2 is now the ONLY difference. Done!

![](/files/-LnYUamfXUC5vDX0tHOl)

To save these steps permanently go to `Session->SaveSession`.  In the future, you can resume these settings by going to `Session->OpenSession`.


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