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Similar todos
Add validation to accept only letters and numbers for display name; may use @ at the beginning 
#highscoredomains
Add validation: min 4 char for display name #highscoredomains
Username validation 
#fun
improve form validation in signup 
#checkoutpage
add user registration 
#colourhunt
validate email & username on edit user page 
#30days 
#vansecrets
add email validation 
#linqmeup
fix for user registration on devise 
#chamados
Make username regex more flexible because before some existing usernames were invalid 
#betalist
fixed username bug