Replacing equation with superscript in word

I want to replace all the into inside my Word 2016. I tried changing all the equations into linear and used replace but it show the error ^' is not valid. My assumption is superscript style is not supported for searching. So, how can I process it? Thanks for reading and any help would be appreciated.

used replace but it show the error ^' is not valid

You get the error because inputting a caret ^ while doing Find-Replace is not permitted. You must insert 2 carets ^^ to find 1. Based on the example you provided:

1. On the Equation tab, click on LaTeX

2. On your equation, click on the arrow on the right. Select "All Linear".

You will get this:

3. Copy from your equation this part: \vec{p^^'}\left. Press Ctrl+H, paste it on the "Find what" box. On the "Replace with" box, paste/enter the expression that must replace, in this case: {\vec{p}}^^'\ \left.

4. Click Replace All. Click on the arrow on the right of an equation, Select "All Professional".

Note that you will need to adapt the Find-Replace expressions based on your equations as they might be different.