use regex for field_name in diag tool
use regex for field_name in diag tool

Test Plan: `> fk generic .*`

Reviewed By: beefon

fbshipit-source-id: f52875e

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