Selects substring matching. The match succeeds if the output contains
the content string. This is the default value for checks without
a matcher option, or where the value of matcher is
CONTENT_MATCHER_OPTION_UNSPECIFIED.
MatchesRegex
Selects regular-expression matching. The match succeeds of the output
matches the regular expression specified in the content string.
Regex matching is only supported for HTTP/HTTPS checks.
NotContainsString
Selects negation of substring matching. The match succeeds if the
output does NOT contain the content string.
NotMatchesRegex
Selects negation of regular-expression matching. The match succeeds if
the output does NOT match the regular expression specified in the
content string. Regex matching is only supported for HTTP/HTTPS
checks.
Unspecified
No content matcher type specified (maintained for backward
compatibility, but deprecated for future use).
Treated as CONTAINS_STRING.
