How to write regular expressions for JMeter? - regex

As I am new in using jmeter I'm stuck to write regular expression for this expression:
/catalog/search_display?category_id=9">Parts</a>
Can somebody help me out.

/catalog/search_display\?category_id=9">Parts</a>
Is that what you need? The question mark needs to be escaped, I don't see anything else noteworthy about it. The JMeter regexes are not enclosed in // and thus the slash is not a special character.

What do you want to extract? I assume that it is 9 (category_id). In that case regular expression extractor configuration should look like:
Reference Name: anything meaningful, i.e. id
Regular Expression: <a href="/catalog/search_display\?category_id=(.+?)"
Template: $1$
Refer extracted value as ${id} where required.
Mention that question mark needs to be escaped by a back slash as it is reserved character in regular expressions.
See Regular Expressions chapter of JMeter's User Manual for Perl5-style regex syntax and examples.
Also be aware that it isn't very recommended to parse HTML using regular expressions and it might be better to use the following post processors instead:
CSS/JQuery Extractor
XPath Extractor

Related

jMeter Regular Expression Extractor with use of variable in regexp

I use jMeter 5.5-Snapshot 3a74a92. I need to use result of previous Regular Expression Extractor stored in variable in next Regular Expression Extractor when both Regular Expression Extractors are under same HTTP Request.
The example of fixed regexp that matches the result is:
<input type=\\"hidden\\" id=\\"def_SomeString\\" value=\\"(.*?)\\"/>
but 'SomeString' is something that is matched by previous Regular Expression Extractor and I have to use variable here. After several tries and analyzing debug output (that can be enabled by putting focus on Regular Expression Extractor then About->Enable Debug, do not forget to disable it later) I found that below regexp properly interprets variable and substitutes it:
<input type=\\\\"hidden\\\\" id=\\\\"def_${myVar}\\\\" value=\\\\"(.*?)\\\\"/>
Why in second expression with variable used all backslashes must be extra escaped in such weird way to match? Looks like using variable requires to use '\\\\"' to match '\"' which is unclear for me. Where in the documentation description of such usage can be found? I can't see anything about it there.
I don't think you need to have these extra escape backslashes in the 2nd regular expression.
I also don't think that using regular expressions for parsing HTML is a good idea, consider using CSS Selector Extractor instead.

Regular Exprssion in JMeter

I have the following in my response body:
aBB1="N|1234A1234|blahblahblah"
I want to take only 1234A1234 using Regular Expression Extractor in jmeter.
Would you kindly provide me a suitable regex, please? Thanks in advance.
You can use aBB1="N\|([0-9A-Z]*)\|blahblahblah"
It extracts combination of digits from 0-9 and alpabets from A-Z
You can use regex101.com to test your regular expressions
More info :
JMeter Extraction using regular expressions
You can use ...
aBB1="N|(.+?)|blahblahblah"
This will extract 1234A1234
You can skip blahblahblah as well, but you need to make sure this aBB1="N|.....| pattern should never change, this will extract value between pipes(||) which is 1234A1234 in this case
aBB1="N|(.+?)|
See Jmeter Reference Here

Regular Expression Syntax for URL extraction

I need to extract the string to the right of the equal sign character in an Apache Jmeter project. I am not familiar with Regular Expression syntax at all, but I think this would be the easiest way to extract it. The url is: https://myserver.com:portnum/im;jsessionid=48E10C95151BFB84D795C90FBC31E8E6
I only need the string to the right of the equal sign, not including the equal sign. My question is, what regular expression should I use to extract the string? Thanks!
It is as simple as =(\w+)
Demo:
References:
JMeter - Regular Expressions
Using RegEx (Regular Expression Extractor) with JMeter
Perl 5 Regex Cheat sheet
Also be aware that there are "smarter" ways of handling JSESSIONID:
In case if it comes as a Cookie you can get its value via HTTP Cookie Manager
If it is being passed as an URL parameter you could use HTTP URL Re-writing Modifier

Regex: Extract string between two strings

This is the issue I face
The String
nt/sign-in?wa=wsignin1.0&wtre
The Need
From that string I need to extract the following
wsignin1.0
The Attempts
So far I have tried the following Regex
wa=(.*?)(?=&amp)
This returns:
wa=wsignin1.0
The "wa=" is not supposed to be there
Perhaps with a look behind?
(?<=wa\=)(.+)(?=\&wtre)
wsignin1.0
JMeter uses Perl5-style regular expressions therefore the regex you are looking for might be as simple as:
wa=(.+?)&wtre
Demo:
Use $1$ as "Template" in your Regular Expresssion Extractor.
See How to Debug your Apache JMeter Script for more details on JMeter tests troubleshooting.
=([\w.]++)
will capture it in the first capture group. Otherwise I think #jivan has a good idea with the lookbehind. A little tweak too it:
(?<==)[\w.]++
Put this in your Regular Expression extractor:
nt/sign-in?wa=([a-zA-Z0-9\.]*)&wtre
I hope this help you.

Regex to extract consent form response data?

i am new to jmeter and i am using regular expression extractor to extract document number which is between
<showDocument> 834446$$$$1601Consent </showDocument>
which field should i check Body or Response Header
The relevant Regular Expression Configuration would be:
Reference Name: anything meaningful, i.e. showDocument
Regular Expression: <showDocument>(.+?)</showDocument>
Template: $1$
You can access extracted value as ${showDocument} where required. See Regular Expressions chapter of JMeter User Manual for more details
By the way, your response part looks like XML so it might be easier and better to consider using XPath Extractor instead. In that case XPath Tutorial would be extremely helpful.