CODEWITHSUNDEEP
javascriptmatch
Memochipan
Memochipan

Reputation: 3465

Repetitive match in JavaScript

I have a problem when trying to use the result of match function in one new match.

This is the code:

<html>
<body>

<script type="text/javascript">

p="somelongtextmelongtextmelongtextmelongtext";

f1 = p.match(/some/g);

document.write(f1);

f2 = f1.match(/om/g);

document.write(f2);

</script>

</body>
</html>

The output is the word "some" when it must be "om". I don't understand this behavior and I need the output of f1 in a more complex situation.

Thanks in advance.

Upvotes: 1

Views: 1147

Answers (2)

joseluisrod
joseluisrod

Reputation: 82

the output is "some" because it is failing on the line: f2 = f1.match(/om/g); it never gets to writing f2.

f1 is an object variable, not a string. the object doesn't have a match method. replace the offfending line with this:

f2 = f1.toString().match(/om/g);

HTH

Upvotes: 0

digitalbath
digitalbath

Reputation: 7354

Are you sure that you pasted the exact same code that you're testing?

I ask because f1 = p.match(/some/g); returns an array of matches, and the Array object does not have a .match method, so f1.match(/om/g); should throw an error.

Anyways, the correct way to do this is:

p="somelongtextmelongtextmelongtextmelongtext";
f1 = p.match(/some/g);
if (f1) {
    f2 = f1[0].match(/om/g);
    console.log(f2);
}

Upvotes: 6

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