在正则表达式中搜索单词

Question

I'm trying to make something where a user can type in a string, !exchange and then a word after. If the word after exchange matches the word huntsman, for example, I want it to do one thing, and another thing for a different word.

I've tried to do

var req = msg.match(/^!exchange/i); //msg is the string that I'm testing

But that doesn't work. I've also tried

var req = msg.match(/^!exchange \b/i); 

But I get the same result. Can anyone help?

Answer 1

To get the word after !exchange , use a capture group:

/^!exchange\s+(\w+)/i

Now req[1] will contain the word after !exchange .

 function doit(input) { var msg = input.value; var req = msg.match(/^!exchange\\s+(\\w+)/i); if (req) { document.getElementById("result").textContent = req[1]; } } 

 <input type="text" id="input" onchange="doit(this)"> <br>Word is <span id="result"></span> 

Answer 2

It sounds like you want something like this:

var msg = "!exchange apple"; msg.match(/^!exchange (.*)/i);

(which returns ["!exchange apple", "apple"] )

String.match() returns an array of the original string, followed by any matching groups. You'll need to match each word after "!exchange" as a group to get them back in the array.