I have a field that contains a text string representing time ("900 ms" for example - all values are in milliseconds) is there a way to extract a number, so i can find values "greater than" or "smaller than"?
...|rex field=<fieldname> "(?<ms>\d+)"
include your fieldname here
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Can you try this please:
|makeresults | eval field="900 ms" | rex field=field "(?<field>\d+)"