JMeter: How to ignore dynamic parameters in response assertions - jmeter

I have to ignore dynamic property value while cmpmarison. Can you please suggest how to do so.
Currently I have used as
(\d+)
And Pattern matching Rule as "Contains"
Can anyone please help on same
regards
Vishal

Given your current setup, if the response will contain any number - your assertion will pass, otherwise it will fail. You can use Perl5-style regular expressions to handle dynamic response parts and static strings for doing the checks. See How to Use JMeter Assertions in Three Easy Steps article for more information.
The other approach is extracting the dynamic parts using Regular Expression Extractor, converting them into JMeter Variables and using these variables in the Response Assertion. Regular Expression Extractor is executed before the assertion so this way you will be able to work it around in a more "transparent" way.

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How to write a regex to get only values of destination btwn destination and departure cities of flight

Blazedemo is the website can anyone help me on this
HTML is not a regular language therefore using regular expressions for parsing HTML is not the best idea
JMeter provides CSS Selector Extractor which provides way more robust, reliable and readable approach to deal with HTML data.
Example:
More information:
CSS Selector Reference
How to Use the CSS/JQuery Extractor in JMeter

How to handle escape characters (backslash) in jmeter

while executing the API's using jmeter tool in the response i get some value as '1K\/vyEh'.
while storing this value in the variable it is observed that the backslash does not get stored in the variable resulting in saving the value as '1K/vyEh'
I need guidance of how to save the value as is in the variable
There are too many "unknowns" in your question so unfortunately it is not possible to provide a comprehensive answer without seeing:
at least partial (better full) response
and the way you're storing the value into a JMeter Variable
Here is a quick demo that in theory it is possible:
The demo assumes:
Dummy Sampler
JSR223 PostProcessor
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I need to extract a request number from "response data"

I am trying to use Regular expression extractor to extract, but i don't know how to use it here. Since the "request number" is visible only in "Response Data" of "View result tree". where should i place the post processor. what would be my regular expression.
edit: I have added my regular expression and result screen
Your response value is a number, without double quotes, so change your Regular expression to
"response":(\d+)
Parsing JSON data using regular expressions is not the best idea, I believe you should be using JSON Extractor instead.
It's available since JMeter version 3.0 and you should be able to use it instead of the Regular Expression Extractor.
The relevant JsonPath query will be as simple as:
$.response
Full configuration just in case:
Also be aware that according to JMeter Best Practices you should always be using the latest version of JMeter so consider migrating to JMeter 5.0 (or whatever is the latest version available at JMeter Downloads page) on next available opportunity.

How to handle captured dynamic value which is keep on changing their position in jmeter

I captured a dynamic value , but that value position is keep on changing on each running. how to handle it.
Ex:
Daysrpc61_g1=68
Daysrpc61_g2=98
Daysrpc61_g3=107
Here i need 98 which potion is _g2, but this position will change in next run.
Please help on this how to handle it.
Most probably your Post-Processor configuration vague, i.e. if you're not interested in 68 and 107 you should amend the extractor logic to return only one value.
Also be aware that in general using regular expressions to parse HTML responses is not the best idea, you should be using CSS Selector Extractor or Xpath/XPath2 Extractor instead.
It sounds like you want a better regular expression extractor to successfully find your value.
Google online regex tester and you'll find many good sites which will help you adapt your regEx to fit exactly and solely the case you want.

how to check that tag does not contain spaces or null as value using regular expression

I am trying to validate a string (containg numbers, alphabets and spaces in between words and also contains trailing and leading white spaces) .I need a regular expression which i can put in response assertion of jmeter
Standard recommendation not to use regular expressions for working with HTML and/or XML.
Go for XPath Assertion instead, using it you can implement your requirement using XPath query like:
//yourElement[#yourTag!='null' and not(contains(#yourTag,' '))]
XPath language is quite easy, at least it is much easier to create and read XPath expressions rather than "regular" ones. Check out XPath Tutorial to get started and How to Use JMeter Assertions in Three Easy Steps guide to learn more about assertions available in JMeter.

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