Regex: Extract string between two strings

Question

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

Answer 1

Perhaps with a look behind?

(?<=wa\=)(.+)(?=\&wtre)

wsignin1.0

Answer 2

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.

Answer 3

=([\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.]++

Answer 4

Put this in your Regular Expression extractor:

nt/sign-in?wa=([a-zA-Z0-9\.]*)&wtre

I hope this help you.