challenge18.html

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	<title>Regex Challenge - Week Eighteen</title>

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		<h1>Regex Tuesday Challenge - Week Eighteen</h1>

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		<p>This challenge is to check to see whether a string is valid IRC message sent to a user or channel. IRC is sufficiently simple that they can be parsed with regular expressions, and proper parser is not required.</p>
		<p>To test a regular expression on the test cases below, type it into the text input. Each test case will be marked as passed or failed respectively - you are aiming to get as many test cases as you can to pass. Note that JavaScript must be enabled for this feature to work. The regex engine used is the JavaScript regex engine; it is similar to PCRE, but with a few differences.</p>

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			<textarea id="find" placeholder="/regexp? here/i"></textarea>
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		<h3>Test cases (<span id='passed-count'>0</span>/36) <a id='permalink' class='button' href='./challenge17.html'>Permalink</a> <label id="hide_passing"><input type="checkbox"> Hide passing tests</label></h3>
		<dl id='tests'>
			<dt>callum!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>match</dd>
			<br>
			<dt>ChanServ!ChanServ@Services. PRIVMSG callum :The message can contain anything except new lines.</dt><dd>match</dd>
			<br><br><br>
			<dt>[a]!abc@test PRIVMSG #chat :Test</dt><dd>match</dd>
			<dt>`|\^!abc@test PRIVMSG #chat :Test</dt><dd>match</dd>
			<br>
			<dt>[_]!abc@test PRIVMSG #chat :Test</dt><dd>match</dd>
			<dt>a0!abc@test PRIVMSG #chat :Test</dt><dd>match</dd>
			<dt>a234567890123456!callum@lynx.io PRIVMSG #chat :Test</dt><dd>match</dd>
			<br>
			<dt>callum!call!um@lynx.io PRIVMSG #chat :Test</dt><dd>match</dd>
			<br>
			<dt>callum!cal@lum@lynx.io PRIVMSG #chat :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG ## :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG #a :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG #()"';:<> :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG #chat ::@*(£&%(*&£'[]</dt><dd>match</dd>
			<br><br>
			<dt>callum!callum@lynx.io PRIVMSG [a] :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG `|\^ :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG [_] :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG a0 :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG a234567890123456 :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG #(cm) :Test</dt><dd>match</dd>
			<br>

			<dt>(cm)!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>no match</dd>
			<br>
			<dt>cm!!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>no match</dd>
			<br>
			<dt>c@m!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>no match</dd>
			<br>
			<dt>c,m!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>no match</dd>
			<br>
			<dt>c$m!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>no match</dd>
			<br>
			<dt>c.m!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>no match</dd>
			<br>
			<dt>c;m!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>no match</dd>
			<br>
			<dt>0a!abc@test PRIVMSG #chat :Test</dt><dd>no match</dd>
			<br>
			<dt>a2345678901234567!callum@lynx.io PRIVMSG #chat :Hello!</dt><dd>no match</dd>
			<br><br>
			<dt>callum!callum@lynx.io PRIVMSG #$ :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG #€ :Test</dt><dd>match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG cm! :Test</dt><dd>no match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG (cm) :Test</dt><dd>no match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG c@m :Test</dt><dd>no match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG c,m :Test</dt><dd>no match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG c$m :Test</dt><dd>no match</dd>
			<br>
			<dt>callum!callum@lynx.io PRIVMSG c.m :Test</dt><dd>no match</dd>
		</dl>
		<div id="congratulations">Congratulations, your regex passes all the test cases! Remember to share this challenge.</div>
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