Regex doesn't work on ExtractText Processor?

rafy — Tue, 21 Apr 2026 07:49:46 GMT

Hello,

I am trying to extract value from a key/value pair json record. I am trying to extract the value of "image" key. I used an ExtractText processor but there was no match. Although, there was a match when i used an online regex extractor(https://onlinetexttools.com/extract-regex-matches-from-text).

Regex i used in the extracttext processor: (?<=\"image\"\s:\s")[A-Z-a-z-0-9\-\:\/\.\_]+

My json record:

{ "id" : "03ee73b8-a553-4575-8dfa-d0da4e7939e9", "url" : "https://ll.thespacedevs.com/2.0.0/launch/03ee73b8-a553-4575-8dfa-d0da4e7939e9/", "launch_library_id" : null, "slug" : "falcon-9-block-5-galaxy-33-34", "name" : "Falcon 9 Block 5 | Galaxy 33 & 34", "status" : { "id" : 2, "name" : "TBD" }, "net" : "2022-10-05T23:07:00Z", "window_end" : "2022-10-06T00:14:00Z", "window_start" : "2022-10-05T23:07:00Z", "inhold" : false, "tbdtime" : false, "tbddate" : false, "probability" : null, "holdreason" : "", "failreason" : "", "hashtag" : null, "launch_service_provider" : { "id" : 121, "url" : "https://ll.thespacedevs.com/2.0.0/agencies/121/", "name" : "SpaceX", "type" : "Commercial" }, "rocket" : { "id" : 7549, "configuration" : { "id" : 164, "launch_library_id" : 188, "url" : "https://ll.thespacedevs.com/2.0.0/config/launcher/164/", "name" : "Falcon 9", "family" : "Falcon", "full_name" : "Falcon 9 Block 5", "variant" : "Block 5" } }, "mission" : { "id" : 5976, "launch_library_id" : null, "name" : "Galaxy 33 & 34", "description" : "Galaxy 33, 34 are two geostationary communications satellites manufactured by Northrop Grumman and operated by Intelsat.", "launch_designator" : null, "type" : "Communications", "orbit" : { "id" : 2, "name" : "Geostationary Transfer Orbit", "abbrev" : "GTO" } }, "pad" : { "id" : 80, "url" : "https://ll.thespacedevs.com/2.0.0/pad/80/", "agency_id" : 121, "name" : "Space Launch Complex 40", "info_url" : null, "wiki_url" : "https://en.wikipedia.org/wiki/Cape_Canaveral_Air_Force_Station_Space_Launch_Complex_40", "map_url" : "http://maps.google.com/maps?q=28.56194122,-80.57735736", "latitude" : "28.56194122", "longitude" : "-80.57735736", "location" : { "id" : 12, "url" : "https://ll.thespacedevs.com/2.0.0/location/12/", "name" : "Cape Canaveral, FL, USA", "country_code" : "USA", "map_image" : "https://spacelaunchnow-prod-east.nyc3.digitaloceanspaces.com/media/launch_images/location_12_20200803142519.jpg", "total_launch_count" : 858, "total_landing_count" : 24 }, "map_image" : "https://spacelaunchnow-prod-east.nyc3.digitaloceanspaces.com/media/launch_images/pad_80_20200803143323.jpg", "total_launch_count" : 154 }, "webcast_live" : false, "image" : "https://spacelaunchnow-prod-east.nyc3.digitaloceanspaces.com/media/launcher_images/falcon_9_block__image_20210506060831.jpg", "infographic" : null, "program" : [ ] }

Expected output:

https://spacelaunchnow-prod-east.nyc3.digitaloceanspaces.com/media/launcher_images/falcon_9_block__image_20210506060831.jpg

Thanks for your help.

Re: Regex doesn't work on ExtractText Processor?

SAMSAL — Mon, 26 Sep 2022 14:23:08 GMT

Hi,

You dont have to use the ExtractText processor for this. Use the EvaluateJsonPath processor with the following configuration:

If you find this helpful please accept solution.

Thanks

Re: Regex doesn't work on ExtractText Processor?

stanere — Wed, 28 Sep 2022 11:07:50 GMT

Hi @rafy,

I tried the same regex with the same sample in 1.13.2 and 1.16.3 and both resulted in image url string.

There can be a case with nifi JSON beautificator, the initial JSON lacks spaces and line breaks.

Expression that works with https://ll.thespacedevs.com/2.0.0/launch/ is:
(?<=\"image\":\")[A-Z-a-z-0-9\-\:\/\.\_]+

and as @SAMSAL said, EvaluateJsonPath is the right tool for this job.

Re: Regex doesn't work on ExtractText Processor?

rafy — Wed, 28 Sep 2022 11:47:15 GMT

Thank you all.

I eventually evaluated the json path to extract the url. My mind was astray as i was using complex solution to a simple problem.

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Regex doesn't work on ExtractText Processor?

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Re: Regex doesn't work on ExtractText Processor?