Question

我目前正尝试使用以下代码验证文本框中的字符串：

 $scope.regexArray = ["Alarm id (?<serverNumber>\d+) has been received from video server number (?<alarmNumber>\d+).", "Alarm id (?<serverNumber>\d+) has been received from video server number (?<alarmNumber>\d+)."];

    $scope.validTextBox = false; 
    $scope.userInput = "";
    $scope.validateExpression = function () {

        angular.forEach($scope.regexArray, function (value, key) {

            var test = $scope.userInput.match(value);

            console.log(test);
        })
    }

test的输出是：

["Alarm id 4 has been received from video server number 4", index: 0, input: "Alarm id 4 has been received from video server number 4", groups: undefined]

0: "Alarm id 4 has been received from video server number 4"
groups: undefined
index: 0
input: "Alarm id 4 has been received from video server number 4"
length: 1
__proto__: Array(0)

我似乎无法访问任何捕获组。尝试test[0]不起作用。

Answer 1

更改为：

(?<serverNumber>\d+)不是捕获组的有效JavaScript regexp语法。 JavaScript只能理解匿名捕获组，例如(\d+)。如进一步说明的那样，您可以在使用[]从匹配数组中提取匹配项后，将匹配名称存储在变量中。
在这种情况下没有必要使代码正常工作，但如果您将regexArray更改为包含实际正则表达式/…/而不是字符串"…"，则代码会更清晰将由.match转换为正则表达式。

以下代码演示了成功的匹配：

var regexArray = [
  /Alarm id (\d+) has been received from video server number (\d+)./,
  /Alarm id (\d+) has been received from video server number (\d+)./
];

var userInput = "Alarm id 1000 has been received from video server number 6.";

regexArray.forEach(function(value) {
  var matches = userInput.match(value);
  console.log(matches);
});

要从matches数组中获取特定匹配项，您可以添加以下代码：

var alarmId = matches[1];
var serverId = matches[2];

请注意，alarmId和serverId将是上述字符串之后的字符串。如果您想将它们转换为数字，那么提取的字符串"012"和"12"将被视为相同，请添加parseInt：

var alarmNumber = parseInt(matches[1], 10);
var serverNumber = parseInt(matches[2], 10);

RegExp匹配返回整个单词而不是组

1 个答案: