正則表達式返回全字匹配結果

如何匹配整個單詞？正則表達式返回全字匹配結果

<!DOCTYPE html> 
 
<html> 
 
<body> 
 

 
<p>Click the button to do a global search for "is" in a strisng.</p> 
 

 
<button onclick="myFunction()">Try it</button> 
 

 
<p id="demo"></p> 
 

 
<script> 
 
function myFunction() { 
 
    var str = "Is Alvin this all there is sis?"; 
 
    var patt1 = /is|alvin/gi; 
 
    var result = str.match(patt1); 
 
    document.getElementById("demo").innerHTML = result; 
 
} 
 
</script> 
 

 
</body> 
 
</html>

來源

2016-11-24 Alvin

預期是什麼？ – Mritunjay

寫出你期望的結果。 –

使用\b字邊界模式。

<!DOCTYPE html> 
 
<html> 
 
<body> 
 

 
<p>Click the button to do a global search for "is" in a strisng.</p> 
 

 
<button onclick="myFunction()">Try it</button> 
 

 
<p id="demo"></p> 
 

 
<script> 
 
function myFunction() { 
 
    var str = "Is Alvin this all there is sis?"; 
 
    var patt1 = /\b(?:is|alvin)\b/gi; 
 
    var result = str.match(patt1); 
 
    document.getElementById("demo").innerHTML = result; 
 
} 
 
</script> 
 

 
</body> 
 
</html>

來源

2016-11-24 04:42:10 Barmar

正則表達式返回全字匹配結果

回答

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