关于javascript:常见正则应用

通过 name 获取 url query 参数

const getQueryByName = (name) => {const queryNameRegex = new RegExp(`[?&]${name}=([^&]*)(&|$)`)
  const queryNameMatch = window.location.search.match(queryNameRegex)
  // 个别都会通过 decodeURIComponent 解码解决
  return queryNameMatch ? decodeURIComponent(queryNameMatch[1]) : ''
}

将字符串首字母转化为大写，剩下为小写

const capitalize = (string) => {const capitalizeRegex = /(?:^|\s+)\w/g

  return string.toLowerCase().replace(capitalizeRegex, (match) => match.toUpperCase())
}

将字符串驼峰化

const camelCase = (string) => {const camelCaseRegex = /[-_\s]+(.)?/g

  return string.replace(camelCaseRegex, (match, char) => {return char ? char.toUpperCase() : ''
  })
}

常见手机号解决

手机号码两头四位数字用 * 示意

const phone = '133123456789'
const phoneReg = /^(\d{3})(\d{4})(\d{4})$/
const sphone = phone.replace(phoneReg, '$1--$3')