js正则表达式练习

匹配完整的名字

function process_name() {
  var field = document.getElementById("name_field");
  var name = field.value;
  var name_pattern = /^(\S+) (\S*) ?\b(\S+)$/;
  if (name_pattern.test(name) === false) {
    alert("Name field is invalid");
    return false;
  }
  var res = name_pattern.exec(name);
  data.first_name = res[1];
  data.last_name = res[3];
  if (res[2].length > 0) {
    data.middle_name = res[2];
  }
  return true;
}

• ^(\S+): first name;
• (\S*) ?\b: middle name;
• \b(\S+)$: last name;

匹配邮件地址

var email_pattern = /^[^\s@]+@[^\s@.]+\.[^\s@]+$/;

• ^[^\s@]+: 开头值@符号之间;
• [^\s@.]+: @至.之间;
• [^\s@]+$: .至结尾;

匹配链接地址

var pattern = /^(?:https?:\/\/)?\w+(?:\.\w+)?(?:\.[A-Z]{2,3})+$/i

• ^(?:https?:\/\/)?\w+: http|https://xxxx
• (?:\.\w+)?: .xxxx
• (?:\.[A-Z]{2,3})+: .xxxx