Find matching strings using Regex in Javascript?

Question

I have a requirement to filter out some of the specified strings in a given line using regx.. This can be easily achievale using string.macth(). But my requirement is little bit tricky.

I have set of keywords, that needs to be identified in a given string. (My input string contains only one expected keyword). I have to form the regX string and that will find which keyword is available in my input string .

Below the sample input and output

  var InString ="one_sam_get_2384823_34534";
  var keyList  = "one|two|three|four|five";

here my expected result is one

or

  var InString ="odfdfg_three_get_2384823_34534";
  var keyList  = "one|two|three|four|five";

here my expected result is three

earlier i used something like this "/^one/i" to find out the single keyword occurance.

But i am struck up in this multi keyword approach. I appreaciate any guidance.

Gumbo · Accepted Answer · 2009-09-11 07:15:43Z

3

You can use the keyList to create a RegExp object:

InString.match(new RegExp(keyList, "i"))

answered Sep 11, 2009 at 7:15

Gumbo

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4 Comments

Cerebrus Over a year ago

Yeah, I believe this is the best way. +1

RameshVel Over a year ago

thanks gumbo, it works.. as CMS suggested, i read the matching keyword using Out[0]

Vinay Sajip Over a year ago

Almost ... "onetwo_three".match(new RegExp("one|two|three", "i"))[0] will return "one", which is not what you want.

RameshVel Over a year ago

yes thats wat i want, cant directly use onetwo_three".match(new RegExp("one|two|three", "i"))[0].. it throws an exp at [0] if no keyword found... so i use a tem var to check if null then i get it from 0th idx...

Christian C. Salvadó · Accepted Answer · 2009-09-11 07:17:59Z

1

Edit:

function findKey (input, keyList) {
  var result = input.match(new RegExp(keyList));

  if (result) {
    return result[0];
  }
}

answered Sep 11, 2009 at 7:17

Christian C. Salvadó

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2 Comments

RameshVel Over a year ago

my requirement is not to pass the keywords indivitually (re.exec(inString)[0]), i have to pass all the keywords in a single expreassion and execute it.. because am not sure abt the keywords thats to be present in the inString

RameshVel Over a year ago

sorry cms.. misunderstood that... urs work perfectly.. thank you very much

mhansen · Accepted Answer · 2009-09-11 07:16:50Z

0

Use a regex of the form var regex = /(one|two|three)/;

answered Sep 11, 2009 at 7:16

mhansen

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Comments

RageZ · Accepted Answer · 2009-09-11 07:17:20Z

0

why don't you user a regular expression like

"/(one|two|three|four|five)/i"

Cheers

answered Sep 11, 2009 at 7:17

RageZ

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