That’s indeed a basic PHP question. Use strpos(). Example:
if ( false !== strpos( $post->post_content, 'foo' ) ) {
wp_enqueue_script();
}
Ps. I suggest you to not hook into wp_enqueue_scripts() but a later hooks, e.g. the_content and then load the JavaScript in the footer. This works best under all circumstances as wp_enqueue_scripts and wp_head are called way earlier before the post content is loaded/displayed.
See How to add stylesheets only to pages with specific shortcode? for an explanation on this as this question here is basically a duplicate.
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