Use thread-safe initialization for regular expression literals
Use thread-safe initialization for regular expression literals

Fixes bug 613943.

spidermonkdust/vala,GNOME/vala,themiwi/vala,playya/vala,frida/vala,frida/vala,Distrotech/vala,GNOME/vala,playya/vala,kamanashisroy/aroop,tjol/vala-tjol,playya/vala,frida/vala,GNOME/vala,jessevdk/vala,spidermonkdust/vala,frida/vala,severinh/vala,flobrosch/vala-fixes,severinh/vala,rvu95/vala,tjol/vala-tjol,Distrotech/vala,themiwi/vala,severinh/vala,GNOME/vala,kamanashisroy/aroop,frida/vala,rvu95/vala,tjol/vala-tjol,jessevdk/vala,flobrosch/vala-fixes,themiwi/vala,spidermonkdust/vala,kamanashisroy/aroop,Distrotech/vala,rvu95/vala,jessevdk/vala,flobrosch/vala-fixes,xdave/pvala