I'm stuck at trying to redirect all urls in specific path to lower case

Question

Im able to get all my urls to redirect to lower case using the following in my conf file

RewriteEngine On
RewriteMap  lc int:tolower
RewriteCond %{REQUEST_URI} [A-Z]
RewriteRule (.*) ${lc:$1} [R=301,L]

works like a charm...

The issue is though, I really need this to apply only to URLs www.example.com/this-doesnt-change/Random_Random_111

or www.example.com/this-doesnt-change/Random/Random_111

or even www.example.com/this-doesnt-change/Random

Basically anything after www.example.com/this-doesnt-change/

I've tried replacing

RewriteCond %{REQUEST_URI} [A-Z]

with

RewriteCond %{REQUEST_URI} this-doesnt-change/.+

but all I get is "too many redirects" error

Or should I be restricting the rule to this path using a function of the conf file?

Any insight is appreciated

EDIT:

the .htaccess file

##
# READ THIS COMPLETELY IF YOU CHOOSE TO USE THIS FILE!
#
# The line 'Options +FollowSymLinks' may cause problems with some server configurations.
# It is required for the use of mod_rewrite, but it may have already been set by your 
# server administrator in a way that disallows changing it in this .htaccess file.
# If using it causes your site to produce an error, comment it out (add # to the 
# beginning of the line), reload your site in your browser and test your sef urls. If 
# they work, then it has been set by your server administrator and you do not need to 
# set it here.
##

RewriteRule \.(jpe?g|png|gif|ico|bmp|pdf|docx?|txt|css|js)$ - [L,NC]

RewriteRule ^([^\s%20]+)(?:\s|%20)+([^\s%20]+)((?:\s|%20)+.*)$ $1-$2$3 [N,DPI]
RewriteRule ^([^\s%20]+)(?:\s|%20)+(.*)$ /$1-$2 [L,R=301,DPI]


RewriteRule ^(server-info|server-status) - [L]


RewriteCond %{REQUEST_URI} !pagespeed



## No directory listings
IndexIgnore *

## Can be commented out if causes errors, see notes above.
Options +FollowSymlinks
Options -Indexes

<IfModule mod_headers.c>
Header always set X-Content-Type-Options "nosniff"
</IfModule>

## Mod_rewrite in use.


RewriteEngine On
RewriteCond %{HTTP_HOST} ^example.com [NC]
RewriteRule ^(.*)$ https://www.example.com/$1 [L,R=301]






## Begin - Rewrite rules to block out some common exploits.
# If you experience problems on your site then comment out the operations listed 
# below by adding a # to the beginning of the line.
# This attempts to block the most common type of exploit `attempts` on Joomla!
#
# Block any script trying to base64_encode data within the URL.
RewriteCond %{QUERY_STRING} base64_encode[^(]*\([^)]*\) [OR]
# Block any script that includes a <script> tag in URL.
RewriteCond %{QUERY_STRING} (<|%3C)([^s]*s)+cript.*(>|%3E) [NC,OR]
# Block any script trying to set a PHP GLOBALS variable via URL.
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
# Block any script trying to modify a _REQUEST variable via URL.
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
# Return 403 Forbidden header and show the content of the root homepage
RewriteRule .* index.php [F]
#
## End - Rewrite rules to block out some common exploits.



RewriteRule ^(this-doesnt-change/[a-zA-Z-]+)_([^/]+)$ /$1/$2 [R=301,L]

#
# If you need to redirect some pages, or set a canonical non-www to
# www redirect (or vice versa), place that code here. Ensure those
# redirects use the correct RewriteRule syntax and the [R=301,L] flags.
#
## End - Custom redirects

##
# Uncomment the following line if your webserver's URL
# is not directly related to physical file paths.
# Update Your Joomla! Directory (just / for root).
##

# RewriteBase /

## Begin - Joomla! core SEF Section.
#
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
#
# If the requested path and file is not /index.php and the request
# has not already been internally rewritten to the index.php script
RewriteCond %{REQUEST_URI} !^/index\.php
# and the requested path and file doesn't directly match a physical file
RewriteCond %{REQUEST_FILENAME} !-f
# and the requested path and file doesn't directly match a physical folder
RewriteCond %{REQUEST_FILENAME} !-d
# internally rewrite the request to the index.php script
RewriteRule .* index.php [L]
#
## End - Joomla! core SEF Section.

php_value upload_max_filesize 5M
php_value post_max_size 10M

the

Answer 1

Use

RewriteRule ^(/this-doesnt-change/.*) ${lc:$1} [R=301,L]

Regex demo here

Regex explanation

--------------------------------------------------------------------------------
  ^                        the beginning of the string
--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    /this-doesnt-             '/this-doesnt-change/'
    change/
--------------------------------------------------------------------------------
    .*                       any character except \n (0 or more times
                             (matching the most amount possible))
--------------------------------------------------------------------------------
  )                        end of \1

Answer 2

Thank you Ryszard Czech as your answer ( comment) worked ( I initially put the code in the wrong place)

Replaced the code to this and it worked like a charm.

RewriteEngine On
RewriteMap  lc int:tolower
RewriteCond %{REQUEST_URI} [A-Z]
RewriteRule ^(/this-doesnt-change/.*) ${lc:$1} [R=301,L]