GoogleRE2
import type { GoogleRE2 } from "https://googleapis.deno.dev/v1/trafficdirector:v3.ts";Google's RE2 _ regex engine. The regex string must adhere to the
documented syntax _. The engine is designed to complete execution in linear
time as well as limit the amount of memory used. Envoy supports program size
checking via runtime. The runtime keys re2.max_program_size.error_level
and re2.max_program_size.warn_level can be set to integers as the maximum
program size or complexity that a compiled regex can have before an exception
is thrown or a warning is logged, respectively.
re2.max_program_size.error_level defaults to 100, and
re2.max_program_size.warn_level has no default if unset (will not
check/log a warning). Envoy emits two stats for tracking the program size of
regexes: the histogram re2.program_size, which records the program size,
and the counter re2.exceeded_warn_level, which is incremented each time
the program size exceeds the warn level threshold.
§Properties
This field controls the RE2 "program size" which is a rough estimate of
how complex a compiled regex is to evaluate. A regex that has a program
size greater than the configured value will fail to compile. In this case,
the configured max program size can be increased or the regex can be
simplified. If not specified, the default is 100. This field is deprecated;
regexp validation should be performed on the management server instead of
being done by each individual client. .. note:: Although this field is
deprecated, the program size will still be checked against the global
re2.max_program_size.error_level runtime value.