From: Robert Klemme <shortcutter@...>
Date: 2009-09-10T18:17:17+09:00
Subject: Re: regex: multiline

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2009/9/10 7stud -- <bbxx789_05ss@yahoo.com>:
> Ahmet Kilic wrote:
>> Hello,
>>
>> I am trying regex samples on this page
>> http://gnosis.cx/publish/programming/regular_expressions.html.
>> My problem is, how can I grep multiline with regex?
>>
>> This is my example;
>> ...
>> =A0*********************************************************************=
********)
>> function TfrmExecMain.SetPrivilege(PrivilegeName: String;
>> =A0 Enable: Boolean): Boolean;
>> var
>> =A0 tpPrev,
>> =A0 tp =A0 =A0 =A0 =A0 : TTokenPrivileges;
>> =A0 token =A0 =A0 =A0: THandle;
>> =A0 dwRetLen =A0 : DWord;
>> begin
>> ...
>> I want to print some parts of this.
>>
>> for example;
>> =A0if function=3D~/\b(^function)\s+(\w+)/
>> print this part=3D=3D=3D> : Boolean;
>> =A0end
>> if line.match(/var/) and line.match(/begin/)
>> =A0print this part =3D=3D> : TTokenPrivileges;
>> =A0print this part =3D=3D> : THandle;
>> =A0and print this =A0=3D=3D> : DWord;
>> end
>>
>> How can i do it?
>
>
> str =3D <<ENDOFSTRING
> function TfrmExecMain.SetPrivilege(PrivilegeName: String;
> Enable: Boolean): Boolean;
> var
> =A0tpPrev,
> =A0tp =A0 =A0 =A0 =A0 : TTokenPrivileges;
> =A0token =A0 =A0 =A0: THandle;
> =A0dwRetLen =A0 : DWord;
> begin
> ENDOFSTRING
>
> md =3D str.match(/function.*?\):\s+(.*?;)/m)
> if md
> =A0puts md[1]
> end
>
> --output:--
> Boolean;

Note that you do not need the /m flag for this to match.  This works
the same without it.  The only difference that /m makes is whether
newlines are matched by .:

irb(main):001:0> s =3D "a\nb\n"
=3D> "a\nb\n"
irb(main):002:0> s[/.*/]
=3D> "a"
irb(main):003:0> s[/.*/m]
=3D> "a\nb\n"

It does not make any difference for \s:

irb(main):004:0> s[/\s+/]
=3D> "\n"
irb(main):005:0> s[/\s+/m]
=3D> "\n"

I'll attach an extended example.

Kind regards

robert

--=20
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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