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How to create Rex to extract a value from string?



I am new to splunk rex, so need help for regex. In logs, i have extracted  string, however again i need to extract a value from string.

Example string :  "Error exception for fetching data =1234567890_1"

Question: From  above string, how can i use rex to get value :1234567890

Request you to please help.


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See answer in Rex for extracting a value from string. (Alternatively, delete this duplicate question.)

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