split, substring, regex and replace

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split
var str = 'test@example.com'
var username = str.split('@')[0]
ready
substring
var str = 'test@example.com'
var username = str.substring(0, str.indexOf('@'))
ready
regex
var str = 'test@example.com'
var username = str.match(/^([^@]*)@/)[1]
ready
replace
var str = 'test@example.com'
var username = str.replace(/@.*$/, '');
ready

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