Wildcard based packet filtering isn't working as expected

[hu55a1n1]

Summary of Bug

Packet filtering wildcards are not working as expected, for eg. the below wilcard PortId 'transfer*' is matching 'ft-transfer'.

policy = 'allow'
list = [
    ['transfer*', 'channel-1'],
]

Version

v0.13.0

Failing test

#[test]
fn packet_filter_regex() {
    let allow_policy = r#"
            policy = 'allow'
            list = [
              ['transfer*', 'channel-1'],
            ]
            "#;

    let pf: PacketFilter = toml::from_str(allow_policy).expect("could not parse filter policy");
    assert!(!pf.is_allowed(
        &PortId::from_str("ft-transfer").unwrap(),
        &ChannelId::from_str("channel-1").unwrap()
    ));
}

Acceptance Criteria

The above test must pass or we should clarify what the wildcard means/matches; the documentation describes the wildcard ica* as all identifiers starting with ica -> https://github.com/informalsystems/ibc-rs/blob/master/config.toml#L206-L212

#             Optionally, each element may also contains wildcards, for eg. 'ica*'
#             to match all identifiers starting with 'ica' or '*' to match all identifiers.

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[romac]

Looks like we forgot to anchor the regex with ^ and $, therefore it matches anywhere within the string. Should be an easy fix, thanks for the report and the test!