What's meaning of "*=" in Nightmare? [duplicate]

This question already has an answer here:

• What is this CSS selector? [class*=“span”] 3 answers

This is a example in Github/Nightmare

var Nightmare = require('nightmare');
var nightmare = Nightmare({ show: true });

nightmare
  .goto('http://yahoo.com')
  .type('form[action*="/search"] [name=p]', 'github nightmare')
  .click('form[action*="/search"] [type=submit]')
  .wait('#main')
  .evaluate(function () {
    return document.querySelector('#main .searchCenterMiddle li a').href
  })
  .end()
  .then(function (result) {
    console.log(result)
  })
  .catch(function (error) {
    console.error('Search failed:', error);
  });

What's meaning of form[action"*=""/search"] in line 3？