1 <stránka

     2 	xmlns="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/strana"

     3 	xmlns:m="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/makro">

     4 	

     5 	<nadpis>Using relpipe-tr-sed with groups and backreferences</nadpis>

     6 	<perex>sed-like substitution with regex groups and backreferences</perex>

     7 	<m:pořadí-příkladu>00800</m:pořadí-příkladu>

     8 

     9 	<text xmlns="http://www.w3.org/1999/xhtml">

    10 	

    11 		<p>

    12 			This tool also support regex groups and backreferences. Thus we can use parts of the matched string in our replacement string:

    13 		</p>

    14 		

    15 		<m:pre jazyk="bash"><![CDATA[relpipe-in-cli generate r 1 a string "some string xxx_123 some zzz_456 other" \

    16 	| relpipe-tr-sed 'r' 'a' '([a-z]{3})_([0-9]+)' '$2:$1' \

    17 	| relpipe-out-tabular]]></m:pre>

    18 		

    19 		<p>Which would convert this:</p>

    20 		<pre><![CDATA[r:

    21  ╭────────────────────────────────────────╮

    22  │ a                             (string) │

    23  ├────────────────────────────────────────┤

    24  │ some string xxx_123 some zzz_456 other │

    25  ╰────────────────────────────────────────╯

    26 Record count: 1]]></pre>

    27 		

    28 		<p>into this:</p>

    29 		<pre><![CDATA[r:

    30  ╭────────────────────────────────────────╮

    31  │ a                             (string) │

    32  ├────────────────────────────────────────┤

    33  │ some string 123:xxx some 456:zzz other │

    34  ╰────────────────────────────────────────╯

    35 Record count: 1]]></pre>

    36 

    37 		<p>

    38 			If there were any other relations or attributes in the stream, they would be unaffected by this transformation,

    39 			becase we specified <code>'r' 'a'</code> instead of some wider regular expression that would match more relations or attributes.

    40 		</p>

    41 		

    42 	</text>

    43 

    44 </stránka>