const s = `
  var express = require('express');
  var bodyParser = require('body-parser');
  var timeout = require('connect-timeout');
  var cors = require('cors');
  var R = require('ramda');
`

const searchString =
    (string, pattern) =>
        string
        .match(new RegExp(pattern.source, pattern.flags))
        .map(match =>
            new RegExp(pattern.source, pattern.flags)
            .exec(match));

searchString(s, /require\(\'(.*)'\)/ig).map(([_,r]) => r)