<s>
^txt2regex$	B-Application
is	O
a	O
regular	B-Language
expression	I-Language
wizard	O
that	O
leads	O
the	O
user	O
through	O
the	O
construction	O
of	O
a	O
regular	B-Language
expression	I-Language
by	O
asking	O
a	O
series	O
of	O
questions	O
.	O
</s>
<s>
The	O
regular	B-Language
expression	I-Language
is	O
generated	O
in	O
the	O
notation	O
used	O
by	O
awk	B-Application
,	O
ed	B-Application
,	O
egrep	O
,	O
Emacs	B-Application
,	O
expect	O
,	O
find	B-Application
,	O
grep	B-Application
,	O
lex	B-General_Concept
,	O
Lisp	B-Language
,	O
MySQL	B-Application
,	O
OpenOffice.org,	O
Perl	B-Language
,	O
PHP	B-Application
,	O
PostgreSQL	B-Application
,	O
Procmail	B-Protocol
,	O
Python	B-Language
,	O
Sed	B-Application
,	O
Tcl	B-Operating_System
,	O
VBscript	B-Application
,	O
Vi	B-Application
,	O
and	O
Vim	B-Application
.	O
</s>
<s>
It	O
is	O
a	O
useful	O
tool	O
for	O
users	O
with	O
little	O
or	O
no	O
knowledge	O
of	O
regular	B-Language
expressions	I-Language
and	O
so	O
is	O
included	O
in	O
several	O
Linux	O
distributions	O
,	O
including	O
Debian	O
,	O
Fedora	O
,	O
Gentoo	B-Application
,	O
Knoppix	O
,	O
and	O
Mandriva	O
,	O
in	O
FreeBSD	B-Operating_System
,	O
and	O
in	O
Fink	B-Application
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
<s>
Although	O
graphical	O
interfaces	O
have	O
typically	O
followed	O
command	O
line	O
interfaces	O
,	O
^txt2regex$	B-Application
is	O
unusual	O
in	O
providing	O
a	O
command	O
line	O
interface	O
for	O
a	O
function	O
usually	O
,	O
and	O
previously	O
,	O
provided	O
by	O
means	O
of	O
a	O
graphical	O
user	O
interface	O
.	O
</s>
<s>
It	O
is	O
also	O
unusual	O
in	O
interacting	O
with	O
the	O
user	O
to	O
facilitate	O
the	O
use	O
of	O
what	O
is	O
generally	O
regarded	O
as	O
a	O
technical	O
tool	O
unsuitable	O
for	O
naive	O
users	O
and	O
in	O
supporting	O
multiple	O
regular	B-Language
expression	I-Language
notations	O
.	O
</s>
<s>
^txt2regex$	B-Application
is	O
a	O
bash	B-Operating_System
script	I-Operating_System
.	O
</s>
