问题
I would like to extract the last occurence of regular expression in Jmeter. I used Regular Extractor expression to do this, but I can't got the last occurence.
I tried this :
- Regular expression: "var1":([^"]+),"var2"
- Template : $1$
- Match No : -1
- Default value : expression_matchNr
Then in my script I used ${expression} variable
I've tested expression_matchNr but it give me the number of match.
What should I put in "Match No:" ?
Thanks in advance
回答1:
If you have the following output:
expression=foo
expression_1=foo
expression_2=bar
expression_3=**what you looking for**
expression_matchNr=3
You can use JMeter's __V function to get value of expression_3 variable
As per function's description:
For example, if one has variables A1,A2 and N=1:
${A1}- works OK${A${N}}- does not work (nested variable reference)${__V(A${N})}- works OK. A${N} becomes A1, and the __V function returns the value of A1
So in your case the function, returning last match no matter how many matches are will look like:
${__V(expression_${expression_matchNr})}
See How to Use JMeter Functions post series on what else can be done with functions.
回答2:
Unfortunately the JMeter core does not support the -1,-2... for ultimate/penultimate etc. notation. You can however find the ultimate occurrence using a negative look-ahead
I stumbled on this problem and for me I solved it using something like this:
[\s\S]*("var1":([^\"]+),"var2")(?!$1$)
and Template: $2$
explanation: match anything until (..1..)-happens where it is not possible to match (..1..) after. Return (..2..)
Also the first occurrence of the item:
("var1":([^\"]+),"var2")(?!$1$)[\s\S]*
As for efficiency, this saves the entire query [\s\S]* in a variable, so it is a bit heavy and I haven't tested if it pulls too much memory If it does, consider using javaScript or JQuery which does support last object methods
来源：https://stackoverflow.com/questions/26648257/how-can-i-get-the-last-match-in-regular-extracor-expression-in-jmeter