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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <151223210157.ZM447@torch.brasslantern.com>
Date: Wed, 23 Dec 2015 21:01:57 -0800
In-Reply-To: <20151223232519.GA9602@chaz.gmail.com>
Comments: In reply to Stephane Chazelas <stephane.chazelas@gmail.com>
        "Re: Example of use of (S) flag" (Dec 23, 11:25pm)
References: <CAKc7PVBLdXYQ_NNU9q=v9TcfiZjsYKfDt2h=ZBdfGCt6t81cuQ__14537.6145992943$1450895198$gmane$org@mail.gmail.com> 
	<20151223232519.GA9602@chaz.gmail.com>
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To: zsh-users@zsh.org
Subject: Re: Example of use of (S) flag
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On Dec 23, 11:25pm, Stephane Chazelas wrote:
} Subject: Re: Example of use of (S) flag
}
} 2015-12-23 19:25:05 +0100, Sebastian Gniazdowski:
} > Hello,
} > completion says that (S) is "search substrings in #, %, /
} > expressions". Can someone provide example of (S) influence? Thanks
} [...]
} 
} $ a=ababa
} $ echo ${(S)a#b}
} aaba
} $ echo ${(S)a%b}
} abaa

Note also that ${(S)var:#pat} is not useful; pat must still match the
entire value of $var (or an element of $var in the array case) for the
element to be matched/removed.

Further note that (MS) is sort of a dumbed-down form of backreferences,
returning something similar to the value of $MATCH in an extendeglob
pattern that uses (#m) (except extendedglob is not needed).  E.g.:

% a=abcba
% echo ${(MS)a#b?}
bc
% echo ${(MS)a%b?}
ba

Here are some examples of the use with ${var/pat/repl}:

torch% echo ${a/b*/x}    
ax
torch% echo ${(S)a/b*/x}
axcba
torch% echo ${(S)a//b*/x}
axcxa