post data with value showing valid response data but same value from regular expression is not showing valid response data in jmeter - jmeter

Question

When manually entering value in below parameters, it's working fine and showing a valid response.
Below post shows data when values are manually entered:
POST https://qatbagp523.unix.gsm1900.org/wcs/resources/store/11151/quoteHandler/syncQuote
POST data:
{
"opportunityId":"92456",
"quoteNumber":"54044"
}
[no cookies]
But same value captured from regular expression will not show valid response data
Below post data values captured from regular expression
POST https://qatbagp523.unix.gsm1900.org/wcs/resources/store/11151/quoteHandler/syncQuote
POST data:
{
"opportunityId":"92456",
"quoteNumber":"54044"
}
[no cookies]
Even same post data values but manually entered post data is showing valid response but regular expression captured post data is not showing valid response
I observed headers and other valuesm there is no change, could any please resolve how to get response and what could be the cause for this type of issues

Answer 1

Given you send the same requests you should be getting the same responses, if you have different responses - most probably you're sending different requests
Compare 2 requests using View Results Tree listener, they should be exactly the same in terms of request body, request headers, etc.
Check the variable which is stored by the Regular Expression Extractor using Debug Sampler, it might the case there are extra spaces, line breaks, etc.
Use a third-party external sniffer tool like Wireshark or Fiddler as View Results Tree listener doesn't always tell the full story
If you won't be able to figure out the root cause of the issue - consider saving all the request and response data for both Samplers and update your question with the XML file containing these details.