https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263268
Bug ID: 263268
Summary: bsdgrep: support empty subexpressions
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: lw...@freebsd.org
CC: kev...@freebsd.org
$ echo foo | egrep "|foo"
egrep: empty (sub)expression
more complex case: "^${user}(|[[:space:]]+.*)$"
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