Netscaler Regex syntax to return last word

Question

I am trying to extract the last word from a user attribute string. The user attribute is AAA.USER.ATTRIBUTE(7) The attribute value string is e.g. "ord1 ord2 ord3 ord4"

If I use the expression

AAA.USER.ATTRIBUTE(7).AFTER_REGEX(re/\s/)

my result is "ord2 ord3 ord4" i.e. i get everything after the first blank space.

I've had a lengthy dialogue with Copilot and an almost as tedious with ChatGPT, they both suggest something like

AAA.USER.ATTRIBUTE(7).AFTER_REGEX(re/s(\w+)$/)

However, that returns a NULL value.

Anyone who knows how I could get that last word?

Both cases:

AAA.USER.ATTRIBUTE(7) = "ord1 ord2 ord3 ord4"

Test 1:

AAA.USER.ATTRIBUTE(7).AFTER_REGEX(re/\s/)

Expected and actual result: "ord2 ord3 ord4" - all after first whitespace

Test 2:

AAA.USER.ATTRIBUTE(7).AFTER_REGEX(re/s(\w+)$/)

Expected result according to ChatGPT and Copilot: "ord4" Actual result: UNDEF (the result in Netscaler GUI's Expression Evaluator)

See Markdown help. In particular, indent a line four spaces to set it off as code. — Cary Swoveland
– Cary Swoveland, Commented Apr 26, 2024 at 17:52
...and you can set off text within a sentence by surrounding it with backtics. For example, to display ...string is e.g. "ord1 ord2 ord3 ord4" as ...string is e.g. "ord1 ord2 ord3 ord4". — Cary Swoveland
– Cary Swoveland, Commented Apr 28, 2024 at 22:22

Bluejay Blackburn · Accepted Answer · 2024-04-26 20:42:24Z

0

To capture everything after the last space, use:

.+\s(.+)$

Adding netscaler's delimiters it would look like this

re#.+\s(.+)$#

The dollar sign anchors the expression to the end of the string. Read about capture grouping (the parentheses) here.

edited Apr 26, 2024 at 20:42

answered Apr 26, 2024 at 20:05

Bluejay Blackburn

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3 Comments

Hans Lindahl Over a year ago

Thanks Bluejay, I’ll try this at work on Monday.

tripleee Over a year ago

Perhaps notice the difference between \s (a whitespace character) and s (the literal character s)

Bluejay Blackburn Over a year ago

Correct, that is why it includes a slash, we want the whitespace. You can also use a space, as in hitting the spacebar, but this way it captures other types of possible whitespace (tab, for example).

Hans Lindahl · Accepted Answer · 2024-04-30 07:29:15Z

0

I'd like to thank Bluejay for his effort. However, Citrix Netscaler is a world of its own, so it didn't work. The solution was given to me in a Citrix Community; lose the Regex and use Netscaler AppExpert expressions instead. The code that worrked was this:

AAA.USER.ATTRIBUTE(7).TYPECAST_LIST_T(' ').GET_REVERSE(0)

Thanks again to Bluejay for the effort - and Cary for the Community N00b help

answered Apr 30, 2024 at 7:29

Hans Lindahl

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