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RegExr was created by gskinner.com.

Edit the Expression & Text to see matches. Roll over matches or the expression for details. PCRE & JavaScript flavors of RegEx are supported. Validate your expression with Tests mode.

The side bar includes a Cheatsheet, full Reference, and Help. You can also Save & Share with the Community and view patterns you create or favorite in My Patterns.

Explore results with the Tools below. Replace & List output custom results. Details lists capture groups. Explain describes your expression in plain English.
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							Build a suite of tests that your expression should (or should not) match.
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		</div>

		<div id="cheatsheet">
			<table class="cheatsheet">
				<tr><th colspan="2" data-id="charclasses">Character classes</th></tr>
				<tr><td>.</td><td>any character except newline</td></tr>
				<tr><td>\w  \d  \s</td><td>word, digit, whitespace</td></tr>
				<tr><td>\W  \D  \S</td><td>not word, digit, whitespace</td></tr>
				<tr><td>[abc]</td><td>any of a, b, or c</td></tr>
				<tr><td>[^abc]</td><td>not a, b, or c</td></tr>
				<tr><td>[a-g]</td><td>character between a & g</td></tr>

				<tr><th colspan="2" data-id="anchors">Anchors</th></tr>
				<tr><td>^abc$</td><td>start / end of the string</td></tr>
				<tr><td>\b  \B</td><td>word, not-word boundary</td></tr>

				<tr><th colspan="2" data-id="escchars">Escaped characters</th></tr>
				<tr><td>\.  \*  \\</td><td>escaped special characters</td></tr>
				<tr><td>\t  \n  \r</td><td>tab, linefeed, carriage return</td></tr>
				<!-- <tr><td>\u00A9</td><td>unicode escaped &copy;</td></tr> -->

				<tr><th colspan="2" data-id="groups">Groups & Lookaround</th></tr>
				<tr><td>(abc)</td><td>capture group</td></tr>
				<tr><td>\1</td><td>backreference to group #1</td></tr>
				<tr><td>(?:abc)</td><td>non-capturing group</td></tr>
				<tr><td>(?=abc)</td><td>positive lookahead</td></tr>
				<tr><td>(?!abc)</td><td>negative lookahead</td></tr>

				<tr><th colspan="2" data-id="quants">Quantifiers & Alternation</th></tr>
				<tr><td>a*  a+  a?</td><td>0 or more, 1 or more, 0 or 1</td></tr>
				<tr><td>a{5} a{2,}</td><td>exactly five, two or more</td></tr>
				<tr><td>a{1,3}</td><td>between one & three</td></tr>
				<tr><td>a+? a{2,}?</td><td>match as few as possible</td></tr>
				<tr><td>ab|cd</td><td>match ab or cd</td></tr>
			</table>
		</div>

		<div id="community" class="community">
			<header>
				<div class="label name"></div>
				<div>
					<svg class="icon favorites"><use xlink:href="#favorites"><title>Favorite (add to My Patterns)</title></use></svg>
					<svg class="icon share"><use xlink:href="#share"><title>Load & open pattern settings</title></use></svg>
				</div>
			</header>
			<div class="actions list">
				<div class="link row">
					<svg class="icon link"><use xlink:href="#link"></use></svg>
					<div class="label">Load</div>
					<div class="url">--</div>
					<svg class="icon copy"><use xlink:href="#copy"><title>Copy to clipboard</title></use></svg>
				</div>
				<div class="rate inactive row">
					<svg class="icon thumb"><use xlink:href="#thumb"></use></svg>
					<div class="label">Rate</div>
					<svg class="icon rate thumbdown"><use xlink:href="#thumb"><title>Rate pattern</title></use></svg>
					<span class="rating">--</span>
					<svg class="icon rate thumbup"><use xlink:href="#thumb"><title>Rate pattern</title></use></svg>
				</div>
			</div>
			<div class="desc"></div>
			<div class="author"></div>
			<hr>
		</div>

		<div id="share">
			<!-- holds all the elements used in the Save & Share section -->
			<div id="share_main">
				<div class="signin row">
					<svg class="icon user"><use xlink:href="#user"></use></svg>
					<div class="label signin"><a>Sign in</a> to avoid losing your patterns!</div>
					<div class="label signout">Signed in as <b class="username">--</b></div>
				</div>
				<div class="save row">
					<div class="message">Saving will create a shareable public link.</div>
					<div class="buttons row">
						<div class="fork button">Fork</div>
						<div class="save button default">Save</div>
						<div class="status"></div>
					</div>
				</div>
				<div class="info">
					<div class="info row">
						<svg class="icon info"><use xlink:href="#info"></use></svg>
						<div class="label">Optional info</div>
					</div>
					<div class="inputs">
						<input class="name" type="text" placeholder="pattern name (recommended)" maxlength="30">
						<input class="author" type="text" placeholder="author name" maxlength="20">
						<textarea class="description" rows="4" placeholder="description" maxlength="250"></textarea>
						<input class="keywords" type="text" placeholder="keywords for search" maxlength="50">
					</div>
				</div>
				<div class="actions list">
					<div class="link row">
						<svg class="icon link"><use xlink:href="#link"></use></svg>
						<div class="label">Shareable link</div>
						<div class="url"></div>
						<svg class="icon copy"><use xlink:href="#copy"><title>Copy to clipboard</title></use></svg>
					</div>
					<div class="private row">
						<svg class="icon private"><use xlink:href="#private"></use></svg>
						<div class="label">Private</div>
						<div class="status"></div>
						<svg class="icon check"><use xlink:href="#check"></use></svg>
					</div>
					<div class="favorites row">
						<svg class="icon favorites"><use xlink:href="#favorites"></use></svg>
						<div class="label">Favorite</div>
						<div class="status"></div>
						<svg class="icon check"><use xlink:href="#check"></use></svg>
					</div>
					<div class="community row">
						<svg class="icon community"><use xlink:href="#community"></use></svg>
						<div class="label">Share with the Community</div>
						<svg class="icon arrow"><use xlink:href="#arrowright"></use></svg>
					</div>
					<div class="delete row">
						<svg class="icon delete"><use xlink:href="#delete"></use></svg>
						<div class="label">Delete</div>
						<div class="status"></div>
					</div>
				</div>
			</div>

			<div id="share_community">
				Edit or add extra information to help people find this expression.
				<div class="inputs">
					<input class="name" type="text" placeholder="pattern name (required)" maxlength="30">
					<input class="author" type="text" placeholder="author name" maxlength="20">
					<textarea class="description" rows="3" placeholder="description" maxlength="250"></textarea>
					<input class="keywords" type="text" placeholder="keywords for search" maxlength="50">
				</div>
				<div class="buttons">
					<div class="button cancel">Cancel</div>
					<div class="button share default"><svg class="icon community"><use xlink:href="#community"></use></svg> Share</div>
					<div class="status"></div>
				</div>
				This will share a public copy of this Expression (including Text) with the Community.
				<b>You will not be able to edit or delete the shared copy.</b>
			</div>
		</div>

		<div id="tests_item">
			<header>
				<svg class="icon fail small"><use xlink:href="#close"><title>Failed</title></use></svg>
				<svg class="icon pass small"><use xlink:href="#check"><title>Passed</title></use></svg>
				<h1><input type="text" class="name" placeholder="Untitled Test"></input></h1>
				<div class="button type">
					<span class="label">Match all</span>
					<svg class="icon dropdown"><use xlink:href="#dropdown"></use></svg>
				</div>
				<svg class="icon delete small"><use xlink:href="#delete"><title>Delete test</title></use></svg>
			</header>
			<article>
				<div class="bar"></div>
				<div class="editor multiline"><div class="pad"></div></div>
			</article>
		</div>
	</div>

	<script src="<%= js_file %>"></script>
	<script id="phpinject">
		/** INJECTED BY PHP **/
		// first param false indicates a local init.
		// php passes either a pattern object, or null.

		regexr.init(false, {
			// local test user:
			userId: 111,
			authenticated: true,
			username: "gskinner",
			author: "grantskinner",
			type: "temporary"
		}, {
			"PCREVersion": "8.38 2015-11-23",
			"PHPVersion": "7.0.22-0ubuntu0.16.04.1"
		});
	</script>
</body>
</html>