aviket

This Plugin searches all the posts, pages with a blog. You have to enclose the term you want to search 
with shortcode like [findwordsc]Searchterm[/findwordsc]. The plugin “Searchterm” is searched throughout the blog. A rolling carousel is displayed 
which contains button links to all the posts and pages, containing the word “Searchterm”. 
After clicking the link, the post is displayed in a modal popup(Thickbox). In the post thus displayed by clicking on the link, all the occurrences of search 
terms are highlighted. The highlighting style is controlled by settings. 
The settings page is opened by clicking in the “Findwords options” menu item in the settings menu. 
mark.js Javascript/ Jquery plugin is used for highlighting. 
Link to the mark.js plugin: 
https://markjs.io

Findwords

This Plugin searches all the posts, pages with a blog. You have to enclose the term you want to search

Marius L. J.

InstaWP

When working on themes and plugins you often notice a piece of text that appears hardcoded into the files, you need to modify it, but you don’t know what theme or plugin it’s in, and certainly not which individual file to look in.
Easily search through your themes, plugins or even WordPress core and be presented with a list of files, the matched text and what line of the file matched your search. 
You can then quickly make edits directly in your browser by clicking the link from the search results.
By default a consistency check is performed when making edits to files, this will look for inconsistencies with braces, brackets and parenthesis that are often accidentally left in. 
This drastically reduces the risk of breaking your site when making edits, but is in no way an absolute guarantee.
Create a replica of your live site a.k.a – <a href="https://wordpress.org/plugins/instawp-connect" rel="ugc">WordPress Staging</a> site before testing substitutions.

String locator

If someone had read my mind

Great plugin


I've used this plugin now a dozen times to track down plugins conflicts for my customers. Truly one of the best debug utilities, up there with Query Monitor!


Great for support

Find and edit code or texts in your themes and plugins

Findwords vs String locator