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	<title>regex &#8211; Robust Perception | Prometheus Monitoring Experts</title>
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		<title>Negative lookahead assertions in PromQL selectors</title>
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		<dc:creator><![CDATA[Brian Brazil]]></dc:creator>
		<pubDate>Mon, 12 Oct 2020 08:40:14 +0000</pubDate>
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		<category><![CDATA[prometheus]]></category>
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		<category><![CDATA[regex]]></category>
		<guid isPermaLink="false">https://www.robustperception.io/?p=5723</guid>

					<description><![CDATA[RE2 doesn't support lookahead, but that doesn't mean you can't do it in another way. Negative lookahead assertions are a feature of Perl Compatible Regular Expressions that says don't match if the following thing matches, without consuming any of the text. This is commonly used to provide an exception to a regex.  For example (?!bar)b.. [&#8230;]]]></description>
		
		
		
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