Re: Help: Regular expressions
- To: mathgroup at smc.vnet.net
- Subject: [mg123070] Re: Help: Regular expressions
- From: "Oleksandr Rasputinov" <oleksandr_rasputinov at hmamail.com>
- Date: Tue, 22 Nov 2011 05:36:25 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <jad600$eig$1@smc.vnet.net>
On Mon, 21 Nov 2011 09:34:56 -0000, Shizu <slivo.vitz at msa.hinet.net> wrote:
> Hello,
>
> Would anybody tell me what's the difference between these two --
> with amd without "^"?
> Regular expressions are not easy for me!
>
>
> In= StringSplit["line1\nline2\nline3", RegularExpression["(?m)^"]] //
> InputForm
>
> Out= {"line1\n", "line2\n", "line3"}
>
> In= StringSplit["line1\nline2\nline3", RegularExpression["(?m)"]] //
> InputForm
>
> Out= {"l", "i", "n", "e", "1", "\n", "l", "i", "n", "e", "2", "\n", "l",
> "i",
> "n", "e", "3"}
>
> Thanks in advance.
>
The difference is that the latter is equivalent to
StringSplit["line1\nline2\nline3", RegularExpression[""]]
since (?m) is just an option which makes ^ match line beginnings rather
than the beginning of the string as a whole.
If you find regular expressions opaque and difficult to work with (and who
doesn't?) then you might be better off using Mathematica's string pattern
syntax instead.
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