The dwgExplore plugin is used to find, count and replace copy/pasted (eventually rotated and scaled) groups of objects (lines, arcs, blocks, texts ...).

Also, it can be used to find and replace similar objects. Examples are:

• drawings imported from pdf another non-Autodesk® AutoCAD® source, or
• drawings generated by vectorization software.

User can easily specify a target group of objects (target pattern) and a replacement group of objects (replacement pattern), and specify different search criteria (rotation/scale, layers, layouts etc …).  

In addition, dwgExplore can:
Batch find and replace text (like AutoCAD FIND command but on an entire batch of drawings with more options and a more user-friendly user interface).

More information: http://www.cpprs.com/dwgexplore.html 

The dwgExplore app comes with 15-day trial with limited functionality.