javascript - 如何将 javascript var 与文本连接起来？

Question

如何将 javascript var xx 与 /\ 和 \b/ 连接起来？

https://jsfiddle.net/6r4o5278/6/

<div onclick="check()">CLICK HERE</div>

<script>
  function check() {
    var str = "abcdefg";
    var xx = "abc";
    if (/\+xx+\b/.test(str)) 
    {
      alert("found");
    } else 
    {
      alert("not found");
    }
  }
</script>

Answer 1

“将 javascript var xx 与/\和\b/连接”是什么意思？另请参阅:

http://www.w3schools.com/jsref/jsref_regexp_test.asp

// The string:
var str = "Hello world!";

// Look for "Hello"
var patt = /Hello/g;
var result = patt.test(str);

// Look for "W3Schools"
patt2 = /W3Schools/g;
result2 = patt2.test(str);