Find people whose username contains "greg".

User
Greg Ivanov
nmcgregor98
Gregory
gregorian
Greggbert
igregs
to_grege
GregoryD
RevGreg
chrisgregory
rexgregbr
antigreg
gregwlsn
gregkise
agregoli
Gregoire
essegreg
gregb1007
greg
BinGregory
gregor-e
gregchttm
gregorg
gregariousrecluse
Egregious_Philbin
AtDuskGreg
gregz72
greggish
Gregor Samsa
gregv
clgregor
kiwigreg
GregW
gregoftheweb
gregoreo
gregdistefano
el-gregorio
GregElin
greggnash
gregoryc
gregvr
Greg Nog
gregschoen
GregX3
greg1948
smithygreg
greggrappone
gregargo
Gregamell
gregstoll
gregrmay
GregWithLime
gregmushen
GregJ99
gregography
gregjones
GreggLD
Greg_Ace
gregoryg
gregtux
gregr
Big Greg
TMcGregor
GREGO578
GregorWill
GregCOTF
GreggKits
gregjenni
agregoire
gregglind
gregmerkle
greggster
gregjunior
Gregstonificatore
gregg
greg@thetiebar.com
greggsandler
Gregarious introvert
gregjor
gregbens72
GregTraver
BonusMcGregor
Gregory B Lemmons
rtgregory
hgregory
gregnnn
Greg Nog Is Bad
gregerrr
egregious theorem
abalonegreg
Greg Hullender
gregorydee
gregorystreit
GregPC