I am doing some url validations and I am getting a failure. It stops all the time after the 6th letter is typed. Below I am typing in "www.google.com" which is in a list of valid urls. However, it fails although it shouldn't.
例如：

w
ww
www
www.
www.g
www.go <-breaks here
www.goo <- continues to break

const validUrl = (value: string | null): string => {
    let item: string
    const regex = /^(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|([a-zA-Z0-9][a-zA-Z0-9-_]{1,61}[a-zA-Z0-9]))\.([a-zA-Z]{2,6}|[a-zA-Z0-9-]{2,30}\.[a-zA-Z]{2,3})+(\.[a-zA-Z]{2,3})?((\/)?[a-z0-9-]{1,61}(\/)?){0,30}$/

    if (value === null || value === '') {
      return ''
    }

    if (value && typeof value === 'string' && !regex.test(value)) {
      for (item in urlStrings) {
        if (item.startsWith(value)) {
          return ''
        } else if (value.startsWith(item)) {
          return ''
        }
      }
    }
    return 'Invalid url'
  }

这是网址字符串：

export const urlStrings: { [key: string]: string } = {
  'www.costco.com': '',
  'www.walmart.com': '',
  'www.google.com': '',
  'www.facebook.com': '',
}