Regex checks for a specific string

Question

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

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

It needs to be case insensitive and take lower and upper caps.

As I said in my previous answer, regular-expressions.info is a good resource to learn regular expressions. Use it! Question: Do you want to test whether mystring contains abc or whether it is equal to abc? — Felix Kling
– Felix Kling, Commented Mar 11, 2011 at 14:45
@Felix, the question asks about the exact string "abc". @detonate, why would you want the overhead and complexity of a regex for a simple text comparison as @Brad mentioned in his answer? — Ken White
– Ken White, Commented Mar 11, 2011 at 15:30
@Ken White: But it also says contains. Only the OP can answer this question. — Felix Kling
– Felix Kling, Commented Mar 11, 2011 at 15:31
I want to make sure it keeps the order correctly and looks for lower and upper caps. Felix, I'm still going through the documentation on Regex. Still need help figuring out these conditions and specific syntax formats. — detonate
– detonate, Commented Mar 11, 2011 at 16:58

Community · Accepted Answer · 2017-05-23 11:55:24Z

3

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.

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

edited May 23, 2017 at 11:55

CommunityBot

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answered Mar 11, 2011 at 14:47

Brad Christie

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3 Comments

detonate Over a year ago

Brad, made an edit. It needs to check for uppercase and lowercase.

Brad Christie Over a year ago

@detonate: It does, that's why it converts the original string to lowercase, then tests against a lowercase comparer. (Unless I'm misunderstanding, in which cases examples are always nice)

detonate Over a year ago

How would I include this in a function using a condition?

Martin Jespersen · Accepted Answer · 2011-03-11 14:42:32Z

1

Just do this:

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

answered Mar 11, 2011 at 14:42

Martin Jespersen

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3 Comments

Alexey Lebedev Over a year ago

I think what @detonate means is /abc/i.test(mystring)

detonate Over a year ago

Martin, made an edit. It needs to check for uppercase and lowercase.

Martin Jespersen Over a year ago

@detonate: the /i makes it case insensitive.

Matt Kenefick · Accepted Answer · 2011-03-11 14:47:34Z

1

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.

answered Mar 11, 2011 at 14:47

Matt Kenefick

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Comments

Desi · Accepted Answer · 2011-03-11 14:51:10Z

0

think the regex expression your looking for is;

^abc$

Hope that helps.

answered Mar 11, 2011 at 14:51

Desi

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1 Comment

detonate Over a year ago

Desi, made an edit. It needs to check for uppercaps and lowercaps.

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