On Thu, 28 Jun 2018, Roumen Petrov wrote:
May be I misunderstand issue.
$ echo ' _head_ABC_a' | egrep ' _head_[A-Za-z0-9_]+_[ad]l*$'
_head_ABC_a
$ echo ' _head_ABC_al' | egrep ' _head_[A-Za-z0-9_]+_[ad]l*$'
_head_ABC_al
but:
$ echo ' _head__al' | egrep ' _head_[A-Za-z0-9_]+_[ad]l*$'
$ echo ' __head_ABC_al' | egrep ' _head_[A-Za-z0-9_]+_[ad]l*$'
$ echo ' _head_ABC_zl' | egrep ' _head_[A-Za-z0-9_]+_[ad]l*$'
Are you sure this actually works?
I'm not expert in regular expressions but according above tests "plus" in RE
works - see case _head__al .
It should match a run of alpha-numeric characters including
underscores. However, I do see that the expression includes a match
of literal underscore and then there is a literal underscore so there
might be something going on with that. Greedy matching would likely
absorb a final underscore so it might not be possible to match on that
final literal underscore. This might expose differences in behaviors
between egreps.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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