javascript - Regex match start of string inside lookahead -

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i trying match word hello on first , third lines:

     hello should matched not want hello matched hello should matched

when use ^\s*hello, things work not want spaces included in result.

(?=\s*)hello closer matches 3 hellos.

i expected either ^(?=\s*)hello or (?=^\s*)hello work, , confused why don't. why don't these work , how can create regex matches only "hello" after whitespace?

create capture group:

str1 = '     hello should matched';  str2 = 'i not want hello matched';  str3 = 'hello should matched';    str1 = str1.match(/^\s*(hello)/);  if (str1) {    str1 = str1[1];  } else {    str1 = '';  }  str2 = str2.match(/^\s*(hello)/);  if (str2) {    str2 = str2[1];  } else {    str2 = '';  }  str3 = str3.match(/^\s*(hello)/);  if (str3) {    str3 = str3[1];  } else {    str3 = '';  }  $('#output').append('str1: ' + str1 + '<br>str2: ' + str2 + '<br>str3: ' + str3 + '');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div id="output"></div>


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