Fix sed call for macs
Fix sed call for macs

Summary:
The mac version of sed doesn't recognize the -r flag, but it does
recognize -E (on linux, the flags do the same thing).

Test Plan: manual test on mac+linux

Reviewed By: dreiss

fbshipit-source-id: f0f68dd

shs96c/buck,grumpyjames/buck,vschs007/buck,shybovycha/buck,facebook/buck,zhan-xiong/buck,davido/buck,darkforestzero/buck,davido/buck,nguyentruongtho/buck,Addepar/buck,marcinkwiatkowski/buck,Addepar/buck,kageiit/buck,marcinkwiatkowski/buck,vschs007/buck,darkforestzero/buck,marcinkwiatkowski/buck,rmaz/buck,davido/buck,zhan-xiong/buck,grumpyjames/buck,k21/buck,k21/buck,SeleniumHQ/buck,marcinkwiatkowski/buck,davido/buck,romanoid/buck,darkforestzero/buck,shs96c/buck,LegNeato/buck,shs96c/buck,LegNeato/buck,Addepar/buck,vschs007/buck,grumpyjames/buck,robbertvanginkel/buck,shs96c/buck,ilya-klyuchnikov/buck,shs96c/buck,grumpyjames/buck,marcinkwiatkowski/buck,rmaz/buck,robbertvanginkel/buck,clonetwin26/buck,k21/buck,shybovycha/buck,dsyang/buck,ilya-klyuchnikov/buck,zpao/buck,facebook/buck,clonetwin26/buck,ilya-klyuchnikov/buck,shybovycha/buck,LegNeato/buck,shybovycha/buck,darkforestzero/buck,clonetwin26/buck,zhan-xiong/buck,dsyang/buck,robbertvanginkel/buck,LegNeato/buck,shs96c/buck,nguyentruongtho/buck,dsyang/buck,LegNeato/buck,darkforestzero/buck,ilya-klyuchnikov/buck,clonetwin26/buck,kageiit/buck,shybovycha/buck,grumpyjames/buck,SeleniumHQ/buck,zhan-xiong/buck,ilya-klyuchnikov/buck,clonetwin26/buck,robbertvanginkel/buck,k21/buck,zhan-xiong/buck,shs96c/buck,darkforestzero/buck,JoelMarcey/buck,LegNeato/buck,darkforestzero/buck,SeleniumHQ/buck,kageiit/buck,rmaz/buck,SeleniumHQ/buck,k21/buck,JoelMarcey/buck,clonetwin26/buck,JoelMarcey/buck,Addepar/buck,zhan-xiong/buck,robbertvanginkel/buck,marcinkwiatkowski/buck,facebook/buck,rmaz/buck,facebook/buck,k21/buck,k21/buck,ilya-klyuchnikov/buck,JoelMarcey/buck,SeleniumHQ/buck,kageiit/buck,grumpyjames/buck,JoelMarcey/buck,vschs007/buck,Addepar/buck,dsyang/buck,SeleniumHQ/buck,SeleniumHQ/buck,marcinkwiatkowski/buck,romanoid/buck,vschs007/buck,dsyang/buck,ilya-klyuchnikov/buck,vschs007/buck,nguyentruongtho/buck,robbertvanginkel/buck,Addepar/buck,nguyentruongtho/buck,SeleniumHQ/buck,brettwooldridge/buck,SeleniumHQ/buck,Addepar/buck,clonetwin26/buck,shs96c/buck,robbertvanginkel/buck,rmaz/buck,vschs007/buck,shybovycha/buck,darkforestzero/buck,davido/buck,shs96c/buck,rmaz/buck,clonetwin26/buck,shybovycha/buck,rmaz/buck,zpao/buck,brettwooldridge/buck,brettwooldridge/buck,dsyang/buck,robbertvanginkel/buck,vschs007/buck,k21/buck,darkforestzero/buck,vschs007/buck,darkforestzero/buck,romanoid/buck,LegNeato/buck,robbertvanginkel/buck,zhan-xiong/buck,shybovycha/buck,JoelMarcey/buck,nguyentruongtho/buck,JoelMarcey/buck,SeleniumHQ/buck,brettwooldridge/buck,shybovycha/buck,davido/buck,ilya-klyuchnikov/buck,zhan-xiong/buck,Addepar/buck,romanoid/buck,grumpyjames/buck,robbertvanginkel/buck,k21/buck,ilya-klyuchnikov/buck,k21/buck,zhan-xiong/buck,clonetwin26/buck,LegNeato/buck,brettwooldridge/buck,grumpyjames/buck,zhan-xiong/buck,darkforestzero/buck,brettwooldridge/buck,zpao/buck,zpao/buck,facebook/buck,marcinkwiatkowski/buck,davido/buck,kageiit/buck,brettwooldridge/buck,dsyang/buck,clonetwin26/buck,SeleniumHQ/buck,Addepar/buck,romanoid/buck,marcinkwiatkowski/buck,dsyang/buck,shs96c/buck,vschs007/buck,JoelMarcey/buck,davido/buck,brettwooldridge/buck,rmaz/buck,dsyang/buck,kageiit/buck,romanoid/buck,romanoid/buck,JoelMarcey/buck,kageiit/buck,romanoid/buck,ilya-klyuchnikov/buck,k21/buck,dsyang/buck,davido/buck,clonetwin26/buck,zhan-xiong/buck,dsyang/buck,shybovycha/buck,shybovycha/buck,marcinkwiatkowski/buck,zhan-xiong/buck,shybovycha/buck,LegNeato/buck,brettwooldridge/buck,rmaz/buck,LegNeato/buck,ilya-klyuchnikov/buck,robbertvanginkel/buck,shybovycha/buck,brettwooldridge/buck,romanoid/buck,vschs007/buck,ilya-klyuchnikov/buck,shs96c/buck,facebook/buck,rmaz/buck,romanoid/buck,davido/buck,zpao/buck,romanoid/buck,rmaz/buck,clonetwin26/buck,romanoid/buck,nguyentruongtho/buck,facebook/buck,rmaz/buck,nguyentruongtho/buck,shs96c/buck,zpao/buck,robbertvanginkel/buck,JoelMarcey/buck,marcinkwiatkowski/buck,SeleniumHQ/buck,robbertvanginkel/buck,clonetwin26/buck,grumpyjames/buck,Addepar/buck,ilya-klyuchnikov/buck,davido/buck,brettwooldridge/buck,zpao/buck,brettwooldridge/buck,marcinkwiatkowski/buck,dsyang/buck,darkforestzero/buck,brettwooldridge/buck,grumpyjames/buck,darkforestzero/buck,k21/buck,LegNeato/buck,zhan-xiong/buck,Addepar/buck,davido/buck,davido/buck,shs96c/buck,dsyang/buck,LegNeato/buck,SeleniumHQ/buck,vschs007/buck,romanoid/buck,marcinkwiatkowski/buck,vschs007/buck,grumpyjames/buck,grumpyjames/buck,LegNeato/buck,JoelMarcey/buck,Addepar/buck,rmaz/buck,Addepar/buck,JoelMarcey/buck,k21/buck,JoelMarcey/buck