Regex matching in OutputAssertionBuilder

Regular expression matching in OutputAssertionBuilder.

so something like this is posible:

let re = Regex::new("[0-9]{2}").unwrap();
assert_cli::Assert::command(&["echo", "42"])
    .stdout().matches(re)
    .unwrap();

Agreed.

See also #20.

take a look at #85 as it has a proposed implementation for this feature.

Copying my comment over from #85

FYI with #98 we are switching to generic predicates. In assert-rs/predicates-rs#18 I'm adding regex to the generic predicates. It doesn't contain repetitions but I have noted that in assert-rs/predicates-rs#12 .

Addressed in assert_cmd
https://github.com/assert-rs/assert_cmd
assert_cli is going to morph into a wider-focused tool, including things like assert_fs. See #41

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