relpipe-data/examples-rename-groups-backreferences.xml
author František Kučera <franta-hg@frantovo.cz>
Mon, 21 Feb 2022 00:43:11 +0100
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<stránka
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	xmlns="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/strana"
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	xmlns:m="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/makro">
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	<nadpis>Using relpipe-tr-sed with groups and backreferences</nadpis>
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	<perex>sed-like substitution with regex groups and backreferences</perex>
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	<m:pořadí-příkladu>00800</m:pořadí-příkladu>
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	<text xmlns="http://www.w3.org/1999/xhtml">
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		<p>
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			This tool also support regex groups and backreferences. Thus we can use parts of the matched string in our replacement string:
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		</p>
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		<m:pre jazyk="bash"><![CDATA[relpipe-in-cli \
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	--relation 'r' \
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		--attribute 'a' string \
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		--record 'some string xxx_123 some zzz_456 other' \
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	| relpipe-tr-sed \
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		--relation 'r' \
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			--attribute 'a' \
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			--value '([a-z]{3})_([0-9]+)' \
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			--replacement '$2:$1' \
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	| relpipe-out-tabular]]></m:pre>
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		<p>Which would convert this:</p>
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		<pre><![CDATA[r:
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 ╭────────────────────────────────────────╮
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 │ a                             (string) │
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 ├────────────────────────────────────────┤
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 │ some string xxx_123 some zzz_456 other │
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 ╰────────────────────────────────────────╯
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Record count: 1]]></pre>
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		<p>into this:</p>
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		<pre><![CDATA[r:
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 ╭────────────────────────────────────────╮
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 │ a                             (string) │
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 ├────────────────────────────────────────┤
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 │ some string 123:xxx some 456:zzz other │
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 ╰────────────────────────────────────────╯
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Record count: 1]]></pre>
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		<p>
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			If there were any other relations or attributes in the stream, they would be unaffected by this transformation,
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			becase we specified <code>'r' 'a'</code> instead of some wider regular expression that would match more relations or attributes.
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		</p>
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	</text>
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</stránka>