has_ipv4_prefix
Indicate whether a text contains an IPv4 address that begins with a prefix.
A prefix is a whole address (192.168.1.11) or one to three octets ending in a dot (192., 192.168., 192.168.1.) and compares whole octets, so 12. does not match 127.0.0.1. The text must hold a complete valid address there, bounded like has_ipv4; an invalid prefix, or a null text, gives false.
Syntax
has_ipv4_prefix(source, ip_address_prefix)Parameters
Prop
Type
Given a dynamic field
This parameter is string-only. In permissive mode — the default — almost every field arrives as a dynamic, so passing one works because Berserk injects asstring: extract-or-null, the value when it really is a string and null otherwise, so the call yields null (a predicate yields false). A property bag or array is therefore not matched, and tostring() is never applied implicitly — use it explicitly to match a bag's JSON text, keys included. Strict mode rejects the dynamic instead of coercing it. See String coercion and the asXXX family.
Returns: bool
Examples
Example 1
print has_ipv4_prefix('05:04:54 127.0.0.1 GET /favicon.ico 404', '127.0.')| print_0 (bool) |
|---|
| true |