Revert regex escape due to broken test.

Revert "Escape values that containt slash (/) at the begining - SOLR 4 intruduced regex queries and this commit is not introducing this functinoality but prevent breaking old code."

This reverts commit d394cf29c64cd57f8274f2a9a04b2f7ea09a8244.

Revert "Fix slash in test."

This reverts commit fd8d0dc0558523dd508d108e44eb7472b3f52ba1.