[SOLVED] Deleting char(s) preceding / on first line in file

After many attempts, this fails:

Code:sed -i -E "1 s/.*\/(.*$)/\/\1/" myfile.txtFor example, myfile.txt of:
blah/de-blah
...

produces:
/
...

NOT:
/de-blah
...

Thanks in advance for any insight you can provide.