what is the regular expression that matches nothing?

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what is the regular expression that matches nothing?

From:	Randy Yates
Subject:	what is the regular expression that matches nothing?
Date:	23 Dec 2004 15:25:18 -0500
User-agent:	Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Military Intelligence)

For use in the xemacs package "efs."
-- 
Randy Yates
Sony Ericsson Mobile Communications
Research Triangle Park, NC, USA
randy.yates@sonyericsson.com, 919-472-1124

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what is the regular expression that matches nothing?, Randy Yates <=
- Re: what is the regular expression that matches nothing? -- I think it is the null expression. When I do "egrep '' somefile" the result is the same as when I do "cat somefile". The result of "egrep -v '' somefile" is, as expected, nothing. HTH, me, 2004/12/23
  - Re: what is the regular expression that matches nothing? -- I think it is the null expression. When I do "egrep '' somefile" the result is the same as when I do "cat somefile". The result of "egrep -v '' somefile" is, as expected, nothing. HTH, Randy Yates, 2004/12/23
- Re: what is the regular expression that matches nothing?, Paul Jarc, 2004/12/27