Fix incorrect backslashing in regexp example, per Robert Treat.
Fix incorrect backslashing in regexp example, per Robert Treat.

royc1/gpdb,lpetrov-pivotal/gpdb,0x0FFF/gpdb,oberstet/postgres-xl,lpetrov-pivotal/gpdb,chrishajas/gpdb,lisakowen/gpdb,xuegang/gpdb,techdragon/Postgres-XL,kmjungersen/PostgresXL,zeroae/postgres-xl,zaksoup/gpdb,Chibin/gpdb,oberstet/postgres-xl,Postgres-XL/Postgres-XL,snaga/postgres-xl,foyzur/gpdb,lisakowen/gpdb,tangp3/gpdb,zaksoup/gpdb,Chibin/gpdb,greenplum-db/gpdb,Chibin/gpdb,edespino/gpdb,foyzur/gpdb,ahachete/gpdb,rubikloud/gpdb,edespino/gpdb,janebeckman/gpdb,lintzc/gpdb,0x0FFF/gpdb,lisakowen/gpdb,kaknikhil/gpdb,randomtask1155/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,kaknikhil/gpdb,ahachete/gpdb,ovr/postgres-xl,pavanvd/postgres-xl,pavanvd/postgres-xl,postmind-net/postgres-xl,kmjungersen/PostgresXL,rubikloud/gpdb,CraigHarris/gpdb,techdragon/Postgres-XL,chrishajas/gpdb,postmind-net/postgres-xl,pavanvd/postgres-xl,royc1/gpdb,CraigHarris/gpdb,zaksoup/gpdb,adam8157/gpdb,kaknikhil/gpdb,xinzweb/gpdb,chrishajas/gpdb,yuanzhao/gpdb,edespino/gpdb,janebeckman/gpdb,50wu/gpdb,edespino/gpdb,snaga/postgres-xl,rubikloud/gpdb,zaksoup/gpdb,foyzur/gpdb,xinzweb/gpdb,tpostgres-projects/tPostgres,ahachete/gpdb,CraigHarris/gpdb,oberstet/postgres-xl,adam8157/gpdb,cjcjameson/gpdb,xuegang/gpdb,greenplum-db/gpdb,lpetrov-pivotal/gpdb,lintzc/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,janebeckman/gpdb,randomtask1155/gpdb,ahachete/gpdb,janebeckman/gpdb,Chibin/gpdb,chrishajas/gpdb,tpostgres-projects/tPostgres,zaksoup/gpdb,ovr/postgres-xl,xinzweb/gpdb,postmind-net/postgres-xl,lpetrov-pivotal/gpdb,rvs/gpdb,foyzur/gpdb,0x0FFF/gpdb,Chibin/gpdb,lintzc/gpdb,adam8157/gpdb,edespino/gpdb,royc1/gpdb,arcivanov/postgres-xl,Postgres-XL/Postgres-XL,greenplum-db/gpdb,kmjungersen/PostgresXL,CraigHarris/gpdb,0x0FFF/gpdb,CraigHarris/gpdb,Postgres-XL/Postgres-XL,yuanzhao/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,50wu/gpdb,rvs/gpdb,xinzweb/gpdb,tangp3/gpdb,lisakowen/gpdb,Postgres-XL/Postgres-XL,yazun/postgres-xl,lintzc/gpdb,Quikling/gpdb,cjcjameson/gpdb,Chibin/gpdb,lintzc/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,tangp3/gpdb,50wu/gpdb,janebeckman/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,kmjungersen/PostgresXL,tangp3/gpdb,chrishajas/gpdb,ahachete/gpdb,tangp3/gpdb,randomtask1155/gpdb,rvs/gpdb,foyzur/gpdb,janebeckman/gpdb,xuegang/gpdb,jmcatamney/gpdb,adam8157/gpdb,rubikloud/gpdb,rubikloud/gpdb,arcivanov/postgres-xl,adam8157/gpdb,lintzc/gpdb,50wu/gpdb,cjcjameson/gpdb,postmind-net/postgres-xl,jmcatamney/gpdb,kmjungersen/PostgresXL,Quikling/gpdb,atris/gpdb,xinzweb/gpdb,yuanzhao/gpdb,rvs/gpdb,rubikloud/gpdb,zaksoup/gpdb,Quikling/gpdb,ahachete/gpdb,0x0FFF/gpdb,yazun/postgres-xl,CraigHarris/gpdb,snaga/postgres-xl,zeroae/postgres-xl,50wu/gpdb,atris/gpdb,adam8157/gpdb,Quikling/gpdb,atris/gpdb,yuanzhao/gpdb,lintzc/gpdb,lpetrov-pivotal/gpdb,xuegang/gpdb,cjcjameson/gpdb,chrishajas/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,0x0FFF/gpdb,lisakowen/gpdb,royc1/gpdb,ovr/postgres-xl,xuegang/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,randomtask1155/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,lisakowen/gpdb,foyzur/gpdb,arcivanov/postgres-xl,lpetrov-pivotal/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,rvs/gpdb,jmcatamney/gpdb,xuegang/gpdb,xuegang/gpdb,xuegang/gpdb,cjcjameson/gpdb,xinzweb/gpdb,tpostgres-projects/tPostgres,atris/gpdb,royc1/gpdb,tangp3/gpdb,randomtask1155/gpdb,randomtask1155/gpdb,edespino/gpdb,oberstet/postgres-xl,Quikling/gpdb,snaga/postgres-xl,jmcatamney/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,chrishajas/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,Quikling/gpdb,ashwinstar/gpdb,Chibin/gpdb,pavanvd/postgres-xl,Chibin/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,arcivanov/postgres-xl,edespino/gpdb,kaknikhil/gpdb,50wu/gpdb,zeroae/postgres-xl,foyzur/gpdb,lintzc/gpdb,postmind-net/postgres-xl,ovr/postgres-xl,50wu/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,royc1/gpdb,zaksoup/gpdb,randomtask1155/gpdb,lpetrov-pivotal/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,kaknikhil/gpdb,tangp3/gpdb,edespino/gpdb,atris/gpdb,techdragon/Postgres-XL,rvs/gpdb,randomtask1155/gpdb,rvs/gpdb,xuegang/gpdb,rubikloud/gpdb,Quikling/gpdb,atris/gpdb,lintzc/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,janebeckman/gpdb,xinzweb/gpdb,chrishajas/gpdb,yuanzhao/gpdb,CraigHarris/gpdb,atris/gpdb,edespino/gpdb,adam8157/gpdb,Postgres-XL/Postgres-XL,cjcjameson/gpdb,atris/gpdb,rubikloud/gpdb,lpetrov-pivotal/gpdb,Quikling/gpdb,yazun/postgres-xl,tangp3/gpdb,janebeckman/gpdb,ovr/postgres-xl,ahachete/gpdb,foyzur/gpdb,yazun/postgres-xl,50wu/gpdb,janebeckman/gpdb,greenplum-db/gpdb,Chibin/gpdb,zaksoup/gpdb,royc1/gpdb,Chibin/gpdb,0x0FFF/gpdb,rvs/gpdb,yazun/postgres-xl,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,rvs/gpdb,jmcatamney/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,CraigHarris/gpdb,adam8157/gpdb,janebeckman/gpdb,ahachete/gpdb,jmcatamney/gpdb,snaga/postgres-xl,CraigHarris/gpdb,edespino/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,rvs/gpdb,royc1/gpdb,0x0FFF/gpdb,Quikling/gpdb,lisakowen/gpdb,Quikling/gpdb