From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-3.3 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 31739 invoked from network); 20 Sep 2022 12:50:23 -0000 Received: from zero.zsh.org (2a02:898:31:0:48:4558:7a:7368) by inbox.vuxu.org with ESMTPUTF8; 20 Sep 2022 12:50:23 -0000 ARC-Seal: i=1; cv=none; a=rsa-sha256; d=zsh.org; s=rsa-20210803; t=1663678223; b=ncFXllBitN19/EsADXYhU4yEJ5MMNc5GXpRZh8DKK/ZGZbirupn5lCT5S9fuKGP1MlE4UtEuUr G/sVJAoGxXY/RfWz6zXjcJLNULHEhs4JZwrYKLz2ASRFcjOuZaXvHqxSnnj25TbXjhOy//EuuC sN/YahN07J8r2RSHOZT81h0MO6BVfImShswf7e1ygdrIGn7n0OiWqYnYWUygJxramIlCKhLaID ceW4/PCTvhm+oeRaZx/gK4HcBXTwkU5htMTNzz6k6oBsDjCB8t9vomSxq6joZS/YkRavdLXCJ1 +YqqLPUewlB1ZTNjzILJK6iS8SqKez4dUc6hGLsE9yDuaQ==; ARC-Authentication-Results: i=1; zsh.org; iprev=pass (relay4-d.mail.gandi.net) smtp.remote-ip=217.70.183.196; dmarc=none header.from=chazelas.org; arc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed; d=zsh.org; s=rsa-20210803; t=1663678223; bh=oQY4JeKPppe+3FGX2iAzKQYSlgCgpvsfQ232dXS8JC0=; h=List-Archive:List-Owner:List-Post:List-Unsubscribe:List-Subscribe:List-Help: List-Id:Sender:In-Reply-To:Content-Transfer-Encoding:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:DKIM-Signature; b=ZOolk7t9ul9jM0aThVrz4Rk2+sCGetW+vyOam5G3NtrbdeO8OZnx/SdcOwQ6+NkziYa+eqBpzF qu0qUea2gBs0oB38wZAnUBv6sYQvCf7TKBWuHpacAJDoPbgkcT5fuMwEXfk/dcTwYhFPqgcbRy /U+LrxMXwk1wVjgBf7bCa+GQpxZeuhJno31yNRl+U0GpnxfaDR1kIyQntPHMWidXqgfAI6WHTV PCxo0Ky19r9U4kR6XkDAunWjM7WdgALRysJTD4U4mHLfF7YdsbLfBRRXdBZEaV5gvuj8RlZdf7 GliBnM1y2zj7GfqmMQDBbiOA23wt99WGkxVQUXxNIZe0GQ==; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=zsh.org; s=rsa-20210803; h=List-Archive:List-Owner:List-Post:List-Unsubscribe: List-Subscribe:List-Help:List-Id:Sender:In-Reply-To:Content-Transfer-Encoding :Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID; bh=3xFz3r+GDq3fD0I8ChlLH5Zph4bsbpKxGWkNbGkmYFQ=; b=CZqbvAUTBRTysEFzU4UzuE3XYn UbE5rhaW/vYEUJkAZ7p9qZMrxfqUBw5nphLoY3JZaAwLUZE9wchb/OLGmkTcl9sUVJlnZxrdBuAeY 7SSOWpHr+/j0p9RmGZcQL4a6qisGeyrkgOvzJCYWeVDec6IgxwIq/6NTJLOuqh6bE0Q7H+qk/SnNl tfk6CWkKTHNe2I5IRkIOn7wcH7HFOLD0OsqYgPJ0j/3kB0Lf1z1N0U8t0cxju3nk09YSNgwCRPbCB +hzrFBnUvc1XPEm9oCcNBkLWHCP3liTxjeN48VHaD3WYV1EZcYrUnoqLF6doelJnL8b4dEdffqzPM +DXtXipA==; Received: from authenticated user by zero.zsh.org with local id 1oachi-000LN9-K2; Tue, 20 Sep 2022 12:50:22 +0000 Authentication-Results: zsh.org; iprev=pass (relay4-d.mail.gandi.net) smtp.remote-ip=217.70.183.196; dmarc=none header.from=chazelas.org; arc=none Received: from relay4-d.mail.gandi.net ([217.70.183.196]:46297) by zero.zsh.org with esmtps (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) id 1oacgS-000KML-LN; Tue, 20 Sep 2022 12:49:05 +0000 Received: (Authenticated sender: stephane@chazelas.org) by mail.gandi.net (Postfix) with ESMTPSA id BFAF3E0010; Tue, 20 Sep 2022 12:49:02 +0000 (UTC) Date: Tue, 20 Sep 2022 13:49:01 +0100 From: Stephane Chazelas To: zzapper Cc: zsh-users@zsh.org Subject: Re: Can I test if a parameter expansion has worked Message-ID: <20220920124901.aucgw4gyvxiz72f2@chazelas.org> Mail-Followup-To: zzapper , zsh-users@zsh.org References: <5dc8b935-f234-ca54-0ceb-50cb1da9bc29@rayninfo.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Seq: 28106 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: 2022-09-15 08:34:34 +0100, zzapper: [...] > f=stuff.jpg; > > print ${f/%(#m).[pjg][npi]e#[gf]/_s$MATCH} > > stuff_s.jpg  # good this is what i want > > # now pass 'bad' input > > f=stuff.txt; > > print ${f/%(#m).[pjg][npi]e#[gf]/_s$MATCH} > stuff.txt  #  expansion has obviously left the input unchanged but can I > test for that??? [...] You could always do: unset flag print -r -- ${f/%(#m).[pjg][npi]e#[gf]/_s$MATCH${flag=}} if (( $+flag )) echo it did substitute Note that "print $var" without the -- is a command injection vulnerability and without -r generally not what you want. -- Stephane