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## `DEFAULT_USER_INPUT_REGEX_ENGINE`

Option | `DEFAULT_USER_INPUT_REGEX_ENGINE`
Description | Specifies which regular expression (regex) engine to use by default for user-provided regex patterns.
Values | `HUMIO` |
| `RE2J` |

Different regex engines have varying syntax support, performance characteristics, and features; this can affect how regex patterns behave in queries, parsers, and other user-defined configurations, impacting both functionality and performance of regex operations.

This parameter is particularly important for environments with heavy regex usage in queries or systems where users might create complex regex patterns.

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