Find matching strings using RegX in Javascript??

Question

Hi,

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.

Cheers

Ramesh Vel

Answer 1

You can use the keyList to create a RegExp object:

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

Answer 2

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

Answer 3

why don't you user a regular expression like

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

Cheers

Answer 4

Edit:

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

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