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Werk #13471: mk_logwatch: validate regular expressions upon rule creation

Component Setup
Title mk_logwatch: validate regular expressions upon rule creation
Date Nov 9, 2021
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME)
2.0.0p16 Checkmk Enterprise (CEE), Checkmk MSP (CME)

Previously invalid regular expressons in the mk_logwatch configuration where not properly validated, leading to a crash of the plugin on the monitored host. We now validate the configured expressions during rule creation.

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