Introduction
Regex or Regular Expression is one of the most powerful, flexible, and efficient text processing approaches. Regex is a sequence of characters that specifies a search pattern in text.
OpsRamp supports regular expressions while creating or editing the alert escalation policy and first response policies. The Regex is used to match the data provided while defining alert and resource conditions. If the data matches, the policy will be applied, and the alert will be escalated for further processing.
The following are some of the examples for common use cases that explain how to use the regex with Property selected as Alert:Subject:
Condition: Contains
To filter the alerts for which the alert subject contains one of the ping, net, or monitor input values, the following regex can be used within the Contains condition:
.*ping.*|.*net.*|.*monitor.*
Condition: Not Contains
To filter the alerts for which the alert subject does not contain any of the ping, net, or monitor input values, the following regex can be used within the Not Contains condition:
.*ping.*|.*net.*|.*monitor.*
Condition: Not Equals
To filter the alerts for which the alert subject is not equal to the ping, net, or monitor input values, the following regex can be used within the Not Equals condition:
.*ping.*|.*net.*|.*monitor.*
Condition: Regex (Starts With)
To filter the alerts for which the alert subject starts with network input value, the following regex can be used within the Regex (Starts With) condition:
Note: In Regex (Starts With), there is no need to add the .* at the beginning of the input value.
network.*|windowsdevice.*|monitor.*
Condition: Regex (Ends With)
To filter the alerts for which the alert subject ends with monitor input value, the following regex can be used within the Regex (Ends With) condition:
Note: In Regex (Ends With), there is no need to add the .* at the end of the input value.
.*network|.*windowsdevice|.*monitor
Condition: Regex (Equals)
To filter the alerts for which the alert subject equals the input value provided in the field, the following regex can be used within the Regex (Equals) condition:
memory|cpu|network|vmware
Regex - ML Training file Support
For the alert ML file, use the below supported regex conditions to validate the expressions.
Condition: Equals
matches(?,".mem.")
Condition: Contains
contains(?,"load")
Condition: Not Contains
not(contains(?, "system"))