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&
Combined from primary sources listed below.

In Regexes§

See primary documentation in context for Conjunction: &

Much like && in a Regexes, it matches successfully if all segments separated by & match the same part of the target string.

& (unlike &&) is considered declarative, and notionally all the segments can be evaluated in parallel, or in any order the compiler chooses.

Just like with || and &, empty first branches are ignored.