This works:
ls -ld /tmp/ | awk '"^.{4}r" {print "TEST"}'
These also work:
ls -ld /tmp/ | awk --posix '/^.{4}r/ { print "TEST"}'
ls -ld /tmp/ | awk --re-interval '/^.{4}r/ { print "TEST"}'
The online awk manual states in section "2.3 Regular Expression
Operators" (http://www.gnu.org/software/gawk/manual/gawk.html#Regexp):
"... by default gawk does not match interval expressions in regexps. If
either --posix or --re-interval are specified (see Options), then
interval expressions are allowed in regexps. ..."
Thus this is *not* a bug.
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https://bugs.launchpad.net/bugs/502027
Title:
gawk fails to parse regular expressions with an interval
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