LINUX.ORG.RU

История изменений

Исправление tz4678, (текущая версия) : 

var s = 'sperma'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
false
var s = 'ozon671games'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
false
var s = 'Mamoep1488'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
true

Без регулярок:

function isValidUsername(s) {
  let digits = false
  let upper = false
  let lower = false
  for (let c of s) {
    if (c >= '0' && c <= '9') {
      digits = true
    } else if (c >= 'a' && c <= 'z') {
      lower = true
    } else if (c >= 'A' && c <= 'Z') {
      upper = true
    } else {
      return false
    }
  }
  return (digits && lower && upper)
}

Исправление tz4678, : 

var s = 'sperma'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
false
var s = 'ozon671games'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
false
var s = 'Mamoep1488'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
true

Без регулярорк:

function isValidUsername(s) {
  let digits = false
  let upper = false
  let lower = false
  for (let c of s) {
    if (c >= '0' && c <= '9') {
      digits = true
    } else if (c >= 'a' && c <= 'z') {
      lower = true
    } else if (c >= 'A' && c <= 'Z') {
      upper = true
    } else {
      return false
    }
  }
  return (digits && lower && upper)
}

Исходная версия tz4678, : 

var s = 'sperma'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
false
var s = 'ozon671games'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
false
var s = 'Mamoep1488'
undefined
/^[a-z\d]+$/i.test(s) && /[A-Z]/.test(s) && /[a-z]/.test(s) && /\d/.test(s)
true