Javascript 为匹配/不匹配的正则表达式返回真/假
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Return true/false for a matched/not matched regex
提问by markzzz
I have this regex on Javascript
我在 Javascript 上有这个正则表达式
var myS = "00 - ??:??:?? - a";
var removedTL = myS.match(/^(\d\d) - (\?\?|10|0\d):(\?\?|[0-5]\d):(\?\?|[0-5]\d) - (.*)/);
and I need to return "false" if mySis not in that format, true otherwise.
如果myS不是那种格式，我需要返回“false” ，否则返回true。
I mean :
我的意思是 ：
var myS = "00 - ??:??:?? - a"; // TRUE
var myS = "00 - ??:?:?? - a"; // FALSE
how can I check if the regex has matched the string or not?
如何检查正则表达式是否与字符串匹配？
采纳答案by Leslie Hanks
The matchmethod will return nullif there is no match.
如果没有匹配，该match方法将返回null。
回答by Lightness Races in Orbit
The more appropriate function here might be RegExp.test, which explicitly gives you true or false.
这里更合适的函数可能是RegExp.test，它明确地为您提供 true 或 false。
console.log(/lolcakes/.test("some string"));
// Output: false
console.log(/lolcakes/.test("some lolcakes"));
// Output: true
回答by user113716
Use a double logical NOT operator.
使用双逻辑非运算符。
return !!removedTL;
This will convert to true/falsedepending on if matches are found.
这将转换为true/false取决于是否找到匹配项。
No matches gives you null, which is converted to false.
没有匹配项给你null，它被转换为false.
One or more matches gives you an Array, which is converted to true.
一个或多个匹配项为您提供一个数组，该数组将转换为true.
As an alternative, you can use .test()instead of .match().
作为替代方案，您可以使用.test()代替.match()。
/^(\d\d) - (\?\?|10|0\d):(\?\?|[0-5]\d):(\?\?|[0-5]\d) - (.*)/.test( myS );
...which gives you a boolean result directly.
...直接给你一个布尔结果。
回答by Megamind Saiko
var myS = "00 - ??:??:?? - a";
var patt = new RegExp("^(\d\d) - (\?\?|10|0\d):(\?\?|[0-5]\d):(\?\?|[0-5]\d) - (.*)");
var removedTL = patt.test(myS);
removedTL will hold a boolean value true if matched, false if not matched
如果匹配，removedTL 将保存一个布尔值 true，如果不匹配，则为 false
回答by SpikePy
Since I also prefer using matchyou could do the following workaround to get a Boolean result:
由于我也更喜欢使用match，您可以执行以下解决方法来获得布尔结果：
var myS = "00 - ??:??:?? - a"
var removedTL = myS.match(/^(\d\d) - (\?\?|10|0\d):(\?\?|[0-5]\d):(\?\?|[0-5]\d) - (.*)/) != null
