Built-in functions are always available in RainerScript without loading modules.

Built-in Functions

Following functions are available in Rainerscript.

See also Module Functions for loadable function modules.

• append_json()
• cnum()
• cstr()
• dyn_inc()
• exec_template()
• exists()
• field()
• format_time()
• get_property()
• getenv()
• int2hex()
• num2ipv4() / ipv42num()
• is_in_subnet()
• is_time()
• lookup()
• parse_json()
• parse_time()
• percentile_observe()
• previous_action_suspended()
• prifilt()
• random()
• re_extract()
• re_extract_i()
• re_match()
• re_match_i()
• replace()
• script_error()
• split()
• strlen()
• substring()
• tolower()
• toupper()
• ltrim() / rtrim()
• wrap()

---

Support: rsyslog Assistant | GitHub Discussions | GitHub Issues: rsyslog source project

Contributing: Source & docs: rsyslog source project

© 2008–2025 Rainer Gerhards and others. Licensed under the Apache License 2.0.