[9fans] cut word out of a line with regexp

[9fans] cut word out of a line with regexp

[Matthias Teege]

Moin!

How do I cut a word out of a line with sed? The word end with a '_'. I
don't know, how to match word boundaries. I need "sample"
out of a sample_ line.

Many thanks
Matthias

Re: [9fans] cut word out of a line with regexp

[Russ Cox]

> How do I cut a word out of a line with sed? The word end with a '_'. I
> don't know, how to match word boundaries. I need "sample"
> out of a sample_ line.

you can match word characters instead.

	sed 's/[^ ]+_ / /'
	sed 's/[a-zA-Z0-9_]+_([^a-zA-Z0-9_])/\1/'

russ

Re: [9fans] cut word out of a line with regexp

[Skip Tavakkolian]

> How do I cut a word out of a line with sed? The word end with a '_'. I
> don't know, how to match word boundaries. I need "sample"
> out of a sample_ line.

that blanks in the char class brackets are [ \t] (space and  tab)
you could expand the chars that can be part of a word, e.g. 0-9

cpuc% cat | sed 's/(^|[ 	]+)[A-Za-z][A-Za-z_]*_([ 	]+|$)/ /g'
this is a test_
this test_ is another
test_ this case too
test_test shouldn't get deleted
multiple test_ should also test_ work

\x04this is a
this is another
 this case too
test_test shouldn't get deleted
multiple should also work