re.place is a module wich acts as a content filter. It searches for pre-defined 
regular expressions and replaces matches with pre-defined replacements.
It is possible to specify different replacements based on several 
“replacement restrictions” — for authenticated users and guests, 
for pages and non-pages currently (see “Screenshots”).
For example, you can implement the functionality of cross-linker module, while 
adding the possibility to insert “target” parameter, “rel=nofollow”, style 
information, etc.
As another example, you can insert in your posts custom smiles or the like.
As another example, you can add custom markup to you blog, like 
 Google(something) would insert link to <code>www.google.com/search?q=something</code>, 
 TouTube(youtube_id) will insert <code><object ...></code>, wich displays that video, 
etc-etc. See “Other notes” for more examples.
You can replace http links with some other stuff for guests, leaving as is for 
authenticated users (see https://wordpress.org/support/topic/297405).
Every entry can have custom “order” number, so you can chain your replacements.
re.place stores entries in database.
Management GUI provided to list entries, add, edit or delete entries.
See changelog for some changes tracking.
<h3>A brief examples</h3>
<ol>
<li>
As a search field, use ‘<code>_—</code>‘ (space in place of <code>_</code>!), 
as a replace — ‘<code>#160;—</code>‘. This will insert non-breaking space 
before every em-dash.
Mmm… You may wish even use ‘<code><span 
style="letter-spacing:0.1ex;">#160;—</code>‘ as a replase to insert 
narrower non-breaking space… If you love typography too much… And you 
can make space after dot wider…
</li>
<li>
Search for ‘<code>:-)</code>‘ and replace with:
‘<code><img src="http://www.kolobok.us/smiles/standart/smile3.gif"' . 
 'alt=":-)" title=":-) (nice smile -- http://www.kolobok.us/smiles/standart/smile3.gif)"' . 
 'style="vertical-align: middle;" /></code>‘
</li>
<li>
Search pattern: <code>YouTube\(([a-zA-Z_0-9\-]*)\)</code>
Replace pattern:
‘<code><object width="425" height="344" data="http://www.youtube.com/v/\1" type="application/x-shockwave-flash"> 
 <param name="movie" value="http://www.youtube.com/v/\1"></param> 
</object></code>‘
This will allow you to use markups like <code>YouTube(TMCf7SNUb-Q)</code> to insert 
Youtube video fragments easily.
</li>
<li>
How to Mass Remove Link (mass deactivate URL Linked text inside posts)? 
(https://wordpress.org/support/topic/288020)
Search pattern: <code><a [^>]*>([^<]*)<\/a></code>
Replace pattern: <code>\1</code>
This will “deactivate” all links in all posts 
(e.g. replace <code><a href="...">Try!</a></code> with just <code>Try!</code>). 
Note, you can activate them back, deactivating this <code>re.place</code> entry.
</li>
<li>
Want to insert drop caps easily?.. Use ‘<code><drop>L</drop>orem ipsum...</code>‘ in your 
posts and replace it with <code>\1</code>‘. Use angle brackets, 
and if you (accidentally) deactivate re.place, these “tags” won’t mess you page.
</li>
<li>
New — in v0.1.3 — [beta-] feature: you can specify different replace patterns 
for authenticated users and “guests”. Sorry, i’ll update screenshots and doc 
ASAP. 🙂
</li>
</ol>

re.place

re.place adds content filter wich searches in posts for specified patterns (regular expressions) and replaces matches found with specified strings.

MonarchWP

Delower Hossain

Quick Search Replace provides a user-friendly interface to run comprehensive search and replace operations on your WordPress database. This tool is designed to search through every column of your selected tables, making it a powerful utility for site migrations (e.g., changing domains or switching to HTTPS).
It correctly handles serialized data and automatically flushes permalinks after a migration to prevent 404 errors.
Key Features:
<ul>
<li>Comprehensive Search: Performs replacements in all columns of the selected tables.</li>
<li>Serialization Support: Correctly handles serialized PHP arrays and objects.</li>
<li>Select Specific Tables: You have full control to choose exactly which tables to include in the operation.</li>
<li>Dry Run: Perform a “dry run” to see a report of how many database fields would be changed, without making any actual modifications.</li>
<li>Permalink Flushing: Automatically flushes WordPress rewrite rules after a live run to ensure your site’s links don’t break.</li>
<li>WordPress Multisite Support: Fully multisite-aware, listing all tables across the network.</li>
</ul>
EXTREME WARNING: This tool is powerful and modifies your database directly. Because it searches every column, it can change sensitive data like user logins, hashed passwords, and post GUIDs if they match your search string. ALWAYS create a full backup of your database before using this tool.

Quick Search Replace


"I wish I had installed this plugin sooner — Quick search replace plugin would have saved me two hours of hunting bad URLs in the database by hand. I ran a “Dry Run” first to locate the problematic content, then ran the search-and-replace again and it worked perfectly. Highly recommended."


Best Search & Replace Plugin

A simple and powerful tool to run search and replace queries on your WordPress database, with full serialization and multisite support.

re.place vs Quick Search Replace