301 Redirect Regex Pattern - regex

Question

I'm trying to make a IIS redirect rule to redirect from this url pattern, but it beats me:
https://www.mycompanyPLC.com/en/lorem/ipsum/whatever
to
https://www.mycompanyLTD.com/lorem/ipsum/whatever
Basically I need to replace PLC with LTD and if there is the "/en/" group in url, this has to be removed.

Answer 1

You can achieve your both the requirements using the single regex provided /en/ is preceded by .com. Something like:
(.*?)PLC\.com(?:\/\ben\b)?(.*)
Explanation of the above regex:
(.*?) - Represents 1st capturing group capturing everything before PLC lazily.
PLC\.com - Matches PLC.com literally.
(?:\/\ben\b)? - Represents a non-capturing group matching \en literally zero or one time. \b represents a word boundary.
(.*) - Represents the second capturing group matching everything after \en greedily.
$1LTD.com$2 - For the replacement(or redirection in this case) part you can get away with this string where $1 represents the first captured group and $2 represents the second captured group. In your case; you can use {R:1}LTD.com{R:2}.
You can find the demo of the above regex in here.

Answer 2

Please refer to below URL rule.
<system.webServer>
<rewrite>
<rules>
<rule name="ReverseProxyInboundRule1" stopProcessing="true">
<match url="en(.*)" />
<action type="Redirect" url="https://www.mycompanyLTD.com{R:1}" />
</rule>
</rules>
</rewrite>
</system.webServer>
There is no need to match a /en URL fragment forcibly. We redirect the request as long as we found that we have a /en URL segment. so does the http/https URL segment.
Feel free to let me know if there is anything I can help with.

Answer 3

After several hours of lecturing Regex I've created this rule and seems to be working (I've tested several scenarios):
^(http|https)://?(www.)mycompanyPLC.com/en?(.*)
and the Redirect URL from IIS is:
https://www.mycompanyLTD.com/{R:3}
Later edit:
The rule in IIS is like this:
<rule name="Replace PLC with LTD and remove /en/" enabled="true" stopProcessing="true">
<match url="(.*?)PLC\.com(?:\/\ben\b)?(.*)" />
<conditions logicalGrouping="MatchAny" trackAllCaptures="false" />
<action type="Redirect" url="{R:1}ltd.com{R:2}" />
</rule>
Test urls were this format:
http://webdev.myCompanyplc.com/en/our-experience/retail
{R:1} = http://webdev.myCompany
{R:2} = /our-experience/retail
Regex expression was ok, but redirect still didnt work