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Question by Matthew S. · Jul 20, 2015 at 09:39 PM ·

Negative look ahead

Does DT do regex negative look aheads? I know on some measurements there is the option of "not regex" which is great, but where there is only transformation regex I need to to exclude text i.e I want "Loading" not to be shown so I'd expect this to work:

^((?!Loading).)*

The regex tester does not like it.

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Answer by Matthew S. · Jul 21, 2015 at 05:42 PM

Had an epiphany!! ^((?!Loading).*) works....

Yes.. the * works inside the brackets in DT (it does work in regex testers outside the bracket!!)

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avatar image Rajesh S. · Jul 21, 2015 at 07:37 PM 0
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Great! Can you replay what Dynatrace version you used for this?

avatar image Matthew S. Rajesh S. · Jul 21, 2015 at 09:30 PM 0
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Sure - 6.1.0.8191.

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Answer by Rajesh S. · Jul 21, 2015 at 05:32 PM

Haven't tried look arounds. Could you test it in different test BT?

If your data has some structure/format you can avoid selecting text by splitting regex into multiple expressions. And capture only what is needed. 

Like : (.*)Loading(.*)|(.*)

Yes, the inbuilt tester works not. Check out https://regex101.com/

Can you enlist some text samples that occur in your data?

 

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