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http://github.com/valkey-io/valkey
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52 lines
2.3 KiB
HTML
52 lines
2.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<html>
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<head>
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<link type="text/css" rel="stylesheet" href="style.css" />
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</head>
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<body>
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<div id="page">
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<div id='header'>
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<a href="index.html">
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<img style="border:none" alt="Redis Documentation" src="redis.png">
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</a>
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</div>
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<div id="pagecontent">
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<div class="index">
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<!-- This is a (PRE) block. Make sure it's left aligned or your toc title will be off. -->
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<b>SubstrCommand: Contents</b><br> <a href="#SUBSTR _key_ _start_ _end_">SUBSTR _key_ _start_ _end_</a><br> <a href="#Return value">Return value</a><br> <a href="#Examples">Examples</a>
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</div>
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<h1 class="wikiname">SubstrCommand</h1>
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<div class="summary">
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</div>
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<div class="narrow">
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#sidebar <a href="StringCommandsSidebar.html">StringCommandsSidebar</a><h1><a name="SUBSTR _key_ _start_ _end_">SUBSTR _key_ _start_ _end_</a></h1>
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<i>Time complexity: O(start+n) (with start being the start index and n the total length of the requested range). Note that the lookup part of this command is O(1) so for small strings this is actually an O(1) command.</i><blockquote>Return a subset of the string from offset <i>start</i> to offset <i>end</i>(both offsets are inclusive).Negative offsets can be used in order to provide an offset starting fromthe end of the string. So -1 means the last char, -2 the penultimate andso forth.</blockquote>
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<blockquote>The function handles out of range requests without raising an error, butjust limiting the resulting range to the actual length of the string.</blockquote>
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<h2><a name="Return value">Return value</a></h2><a href="ReplyTypes.html">Bulk reply</a><h2><a name="Examples">Examples</a></h2><pre class="codeblock python" name="code">
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redis> set s "This is a string"
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OK
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redis> substr s 0 3
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"This"
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redis> substr s -3 -1
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"ing"
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redis> substr s 0 -1
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"This is a string"
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redis> substr s 9 100000
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" string"
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</pre>
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</div>
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</div>
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</div>
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</body>
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</html>
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