Rules Expression Editor

Passive monitors and other monitors that provide pattern checking enable you to apply simple regular expression syntax. You can use a rule expression to test a string or a page of text for pattern matching. You can check for word frequency, HTTP error pages, literal strings, and much more.

• Regular Expression
  • Select from a list of patterns.
  • Match case. Enable case-sensitive match.
  • Invert result. (Inverse match) Evaluate to true when not a match.
• Comparison text. Provide a target string for testing purposes.
• Test. Test if your expression pattern matches the target.

After creating and testing the expression, click OK to insert the string into the Match on box.

Note: If you have multiple payload "match on" expressions, they are linked by "OR" logic - not "AND" logic. Example: If you have two expressions, one set to "AB" and the other to "BA", it will match against a trap containing any of the following: "AB" or "BA" or "ABBA".

See Also Monitors Monitor Types Assigning Monitors Critical Active Monitors Active Monitors Passive Monitors Performance Monitors Advanced settings: performance monitor collection Configure Memory Threshold Configure Disk Performance Threshold Adding Custom Thresholds Ping Advanced Settings Active Monitor Advanced Properties Advanced Settings