Regex checks for a specific string

How can I modify this script so it checks and makes sure it contains the exact string "abc"?

(/^[a].*/i.test(mystring))

It needs开发者_开发百科 to be case insensitive and take lower and upper caps.

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Though you can use regex, I feel this is better suited for .toLowerCase & .indexOf:

var hasABC = ("myabcstring".toLowerCase().indexOf("abc") !== -1);

Regex seems like overkill to me.

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Answer to a comment:

var mystring = "FoOaBcBaR";
function checkForABC(){
  if (mystring.toLowerCase().indexOf('abc') != -1)
    alert('found ABC!');
  else
    alert('Did NOT find ABC');
}
checkForABC();

Demo

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Just do this:

/^abc$/i.test(mystring);

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If it's a simple check for a straight string, using something like

var exists = (mystring.toLowerCase().indexOf('abc') > -1);

To avoid excessive Regex usage as they usually command more resources.

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think the regex expression your looking for is;

^abc$

Hope that helps.