From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: help-gnu-emacs@gnu.org
Subject: Re: How to check whether a character (or one-character string) is a letter?
Date: Sat, 04 Oct 2014 10:58:44 +0800 [thread overview]
Message-ID: <87r3yo1qxn.fsf@ericabrahamsen.net> (raw)
In-Reply-To: 87iok0y8wr.fsf@wmi.amu.edu.pl
Marcin Borkowski <mbork@wmi.amu.edu.pl> writes:
> Hello,
>
> this is a problem I have.
>
> Assume that I have a character (taken from some string, which in turn is
> copied from the buffer - so it need not be ASCII). What is the best way
> to check whether it is a letter within ASCII range?
>
> The reason I'm asking is that I'm writing a function which converts an
> arbitrary string to a valid (and nice) filename (e.g., only letters and
> hyphens) - so basically I want to walk a string character by character
> and convert any space to a hyphen and omit any other non-letter. Am I
> reinventing the wheel?
The safest thing is probably still replace-regexp-in-string. You can use
the [:ascii:] character class to strip out anything that isn't ascii,
with a regexp like "[^[:ascii:]]+". Messing with the string at the
character level shouldn't be necessary.
Eric
next prev parent reply other threads:[~2014-10-04 2:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-04 0:29 How to check whether a character (or one-character string) is a letter? Marcin Borkowski
2014-10-04 1:38 ` Thorsten Jolitz
[not found] ` <CAOj2CQQsnNxtUPzPV8Vw_DgfGFXUUkZExHbArAu_zDjQn-prvw@mail.gmail.com>
2014-10-04 2:47 ` Fwd: " John Mastro
2014-10-05 0:11 ` Marcin Borkowski
2014-10-04 2:58 ` Eric Abrahamsen [this message]
2014-10-04 4:08 ` Yuri Khan
2014-10-05 0:08 ` Marcin Borkowski
2014-10-04 7:29 ` Eli Zaretskii
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