BashRC: Made ff regex aware.

lib/helper/find.sh

@@ -10,7 +10,7 @@
 # ff:  to find a file under the current directory
 function ff()
 {
-    /usr/bin/find . -name '*'"$@"'*' | grep -i "$@"
+    /usr/bin/find . | grep -iP "$@"
 }
 
 # ffs: to find a file whose name starts with a given string