Remove string at end of URL - .htaccess

Question

I can't figure out how to remove the string {jass_domain_name}/jass/jass.js?cb=47 from the end of my URLs using .htaccess. I've looked through a bunch of responses here and tried all of the following - they either crash the site or give me a js error.
RewriteCond %{REQUEST_URI} ^(.*)\{jass_domain_name}​/jass​/jass\.js\?cb=47(.*)$
RewriteRule . %1/%2 [R=301,L]
RewriteCond %{REQUEST_URI} ^(.*)Q\{jass_domain_name}/jass/jass.js?cb=47\E
RewriteRule . %1/%2 [R=301,L]
RewriteCond %{REQUEST_URI} ^/([a-zA-Z0-9_-]+){jass_domain_name}/jass/jass.js?cb=47$
RewriteRule ^(.*) http://www.elearnenglishlanguage.com/blog/%1 [R,L]
RewriteRule ^/(.*)\{(.*) http://www.elearnenglishlanguage.com/blog/$1
Thanks in advance for any advice.
ETA my /blog/.htaccess
RewriteEngine On
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s/+(.*?)%7Bjass_domain_name%7D/jass/jass\.js\?cb=47\sHTTP [NC]
RewriteRule ^ /%1? [L,NE,R=302]
#WFIPBLOCKS - Do not remove this line. Disable Web Caching in Wordfence to remove this data.
Order Deny,Allow
Deny from 54.74.250.230
Deny from 54.177.48.98
Deny from 54.177.53.123
Deny from 54.170.232.157
#Do not remove this line. Disable Web Caching in Wordfence to remove this data - WFIPBLOCKS
#WFCACHECODE - Do not remove this line. Disable Web Caching in Wordfence to remove this data.
<IfModule mod_deflate.c>
AddOutputFilterByType DEFLATE text/css text/x-component application/x-javascript application/javascript text/javascript text/x-js text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon application/json
<IfModule mod_headers.c>
Header append Vary User-Agent env=!dont-vary
</IfModule>
<IfModule mod_mime.c>
AddOutputFilter DEFLATE js css htm html xml
</IfModule>
</IfModule>
<IfModule mod_mime.c>
AddType text/html .html_gzip
AddEncoding gzip .html_gzip
AddType text/xml .xml_gzip
AddEncoding gzip .xml_gzip
</IfModule>
<IfModule mod_setenvif.c>
SetEnvIfNoCase Request_URI \.html_gzip$ no-gzip
SetEnvIfNoCase Request_URI \.xml_gzip$ no-gzip
</IfModule>
<IfModule mod_headers.c>
Header set Vary "Accept-Encoding, Cookie"
</IfModule>
<IfModule mod_rewrite.c>
#Prevents garbled chars in cached files if there is no default charset.
AddDefaultCharset utf-8
#Cache rules:
RewriteEngine On
RewriteBase /
RewriteCond %{HTTPS} on
RewriteRule .* - [E=WRDFNC_HTTPS:_https]
RewriteCond %{HTTP:Accept-Encoding} gzip
RewriteRule .* - [E=WRDFNC_ENC:_gzip]
RewriteCond %{REQUEST_METHOD} !=POST
RewriteCond %{HTTPS} off
RewriteCond %{QUERY_STRING} ^(?:\d+=\d+)?$
RewriteCond %{REQUEST_URI} (?:\/|\.html)$ [NC]
RewriteCond %{HTTP_COOKIE} !(comment_author|wp\-postpass|wf_logout|wordpress_logged_in|wptouch_switch_toggle|wpmp_switcher) [NC]
RewriteCond %{REQUEST_URI} \/*([^\/]*)\/*([^\/]*)\/*([^\/]*)\/*([^\/]*)\/*([^\/]*)(.*)$
RewriteCond "%{DOCUMENT_ROOT}/blog/wp-content/wfcache/%{HTTP_HOST}_%1/%2~%3~%4~%5~%6_wfcache%{ENV:WRDFNC_HTTPS}.html%{ENV:WRDFNC_ENC}" -f
RewriteRule \/*([^\/]*)\/*([^\/]*)\/*([^\/]*)\/*([^\/]*)\/*([^\/]*)(.*)$ "/blog/wp-content/wfcache/%{HTTP_HOST}_blog/$1~$2~$3~$4~$5_wfcache%{ENV:WRDFNC_HTTPS}.html%{ENV:WRDFNC_ENC}" [L]
</IfModule>
#Do not remove this line. Disable Web caching in Wordfence to remove this data - WFCACHECODE
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blog/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]
</IfModule>
# END WordPress
# prevent comment posting to requests with no referer
RewriteEngine On
RewriteCond %{REQUEST_METHOD} POST
RewriteCond %{REQUEST_URI} .wp-comments-post\.php*
RewriteCond %{HTTP_REFERER} !.*elearnenglishlanguage.com.* [OR]
RewriteCond %{HTTP_USER_AGENT} ^$
RewriteRule (.*) ^http://www.elearnenglishlanguage.com/blog/$ [R=301,L]

Answer 1

You can use this rule as very first rule in your DOCUMENT_ROOT/.htaccess file:
RewriteEngine On
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s/+(.*?)%7Bjass_domain_name%7D/jass/jass\.js\?cb=47\sHTTP [NC]
RewriteRule ^ /%1? [L,NE,R=302]