javascript语法错误:正则表达式无效 [英] javascript syntax error: invalid regular expression

问题描述

我正在用JavaScript编写应用程序.在我的应用程序中，有一个搜索字符串/正则表达式的选项.问题是，如果用户键入错误的值，则匹配项将返回javascript错误.示例代码:

I am writing an application in javascript. In my application there is an option to search for a string/regex. The problem is match returns javascript error if user types wrong value. Sample code:

  function myFunction() {
      var filter = $("#text_id").val();
      var query = "select * from table";
      var found;
      if (query.match(filter) != -1) {
        found = true;
      } 
      else{
        found = false;
      }
       //Do something
    }

jsfiddle: http://jsfiddle.net/ZVNMq/

jsfiddle: http://jsfiddle.net/ZVNMq/

输入字符串: sel/\

匹配返回js错误-未捕获的SyntaxError:模式结尾处无效的正则表达式:/sel \/:\.

有什么方法可以检查字符串是否为有效的正则表达式?

Is there any way to check whether the string is valid regex or not?

推荐答案

使用try-catch语句:

Use a try-catch statement:

function myFunction() {
    var filter = $("#text_id").val();
    var query = "select * from table";
    try {
        var regex = new RegExp(filter);
    } catch(e) {
        alert(e);
        return false;
    }
    var found = regex.test(query);
}

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