Werk #17075: Fix regex error when using global flags when matching multiple expressions

Component

Setup

Title

Fix regex error when using global flags when matching multiple expressions

Date

Jun 21, 2024

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.4.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0p8	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.2.0p28	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

There are a few places where we concatenate multiple regular expressions to save performance. This concatenation broke when expressions using global flags such as "(?i)cpu" were concatenated. With this werk, we are converting these global flags to local ones for that specific expression which restores the expected behavior of the expression, fixing various crashes that would occur for example when updating or activating changes.

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