Which pattern represents any characters including space, \t \n?
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Pedro.
Thomas W. wrote:
Which pattern represents any characters including space, \t \n?
It’s \s
I think he actually wants /./m as he said “any character” and not “any
whitespace character”.
HTH,
Sebastian
On Mon, Sep 1, 2008 at 10:20 AM, Zhao Yi [email protected] wrote:
Which pattern represents any characters including space, \t \n?
It’s \s
Sebastian H. wrote:
Thomas W. wrote:
Which pattern represents any characters including space, \t \n?
It’s \s
I think he actually wants /./m as he said “any character” and not “any
whitespace character”.HTH,
Sebastian
I think this is better [.\s]
Sebastian H. wrote:
Zhao Yi wrote:
I think this is better [.\s]
No, it’s not.
Why? It should match any character.
Zhao Yi wrote:
I think this is better [.\s]
No, it’s not.
Zhao Yi wrote:
Which pattern represents any characters including space, \t \n?
The pattern that matches any character is
/./m
The /m switches the Regexp into multiline mode, and then . matches also
\n.
TPR.
Zhao Yi wrote:
From the docs, http://www.ruby-doc.org/docs/UsersGuide/rg/regexp.html
|\s| space character; same as |[ \t\n\r\f]
That is not any character it is only whitespace.
|
Zhao Yi wrote:
Why? It should match any character.
Yes, but so does just . when you specify the m modifier. So why make it
[.\s]
if you can just do . ?
Hi –
On Mon, 1 Sep 2008, Sebastian H. wrote:
Zhao Yi wrote:
Why? It should match any character.
Yes, but so does just . when you specify the m modifier. So why make it [.\s]
if you can just do . ?
It depends whether you want to use . without including \n somewhere
else in your regex, and therefore don’t want the m modifier.
David
Hi –
On Mon, 1 Sep 2008, Peter H. wrote:
Why? It should match any character.
From the docs, http://www.ruby-doc.org/docs/UsersGuide/rg/regexp.html
|\s| space character; same as |[ \t\n\r\f]
That is not any character it is only whitespace.
Yes, but [.\s] is a character class, consisting of any character other
than \n, plus any space including \n. So it will match any character.
David
David A. Black wrote:
It depends whether you want to use . without including \n somewhere
else in your regex, and therefore don’t want the m modifier.
Good point.
Generally, “.” matches characters including what “\s” matches.
Save your presence, I think you’d better learn more basic regular
expression knowledge first.
2008/9/1 Sebastian H. [email protected]:
Zhao Yi wrote:
Why? It should match any character.
Yes, but so does just . when you specify the m modifier. So why make it [.\s]
if you can just do . ?
One reason would be that you need option /m which is effective for the
whole RX. You can avoid that by doing /(?m:.)/
Cheers
robert
Additionally, you can use pattern “(.|\n)” if you want to match all
characters including “\n” in single line mode.
Hi –
On Mon, 1 Sep 2008, Patrick He wrote:
Generally, “.” matches characters including what “\s” matches.
No, by default . does not match \n. You can make it do so with the /m
modifier.
David
Yes, thank you for reminding me. 
Hi –
On Mon, 1 Sep 2008, Patrick He wrote:
Additionally, you can use pattern “(.|\n)” if you want to match all
characters including “\n” in single line mode.
Ruby regexes don’t really have a single vs. multiple line mode
distinction. They always act as if they have the Perl /m modifier in
place, so that ^ and $ match beginning and end of line but never
beginning and end of string. So Ruby’s default mode is like Perl’s
multi-line mode. Ruby doesn’t really have a single-line mode. /m just
adds \n to the . class, so it’s sort of single line, but ^ and $ still
match lines and not the whole string.
David
On Sep 1, 2008, at 4:27 AM, David A. Black wrote:
From the docs, http://www.ruby-doc.org/docs/UsersGuide/rg/regexp.html
|\s| space character; same as |[ \t\n\r\f]
That is not any character it is only whitespace.
Yes, but [.\s] is a character class, consisting of any character other
than \n, plus any space including \n. So it will match any character.
No, it’s not:
“a” =~ /[.\n]/
=> nil
The period loses its special meaning inside a character class, so that
class literally matches a period or a newline character.
James Edward G. II