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What syntax should I use to provide regex?

The correct form of regular expression is delimiter{pattern}delimiter, f.e. /^([a-z]*)$/i or @^(?:http://)?([^/]+)@i. Every form compatible with functions checking correctness of regular expressions in PHP are allowed (example).

Why should I type pattern with delimiters?

The reason is obvious. With delimiters you have a chance to add modifiers to the regexp. Otherwise script will automatically add / at the beginning and / at the end of the pattern.

Can I add any content to the tester?

Generally, the user determines what content and at what way he wants to test, but it must have full rights to publish the test content because it will be available for other Internet users. You should also avoid writing obscene phrases, vulgar phrases, or suggest resources incompatible with Polish law. You are fully responsible for the content posted by you on the site. On the reasoned request of a third party individual entries can be removed from the site.

What are regular expressions?

A regular expression is a pattern that describes a set of strings.

wikipedia.org - definition
regular-expressions.info - knowledge compendium
php.net - using in PHP

Where can I find examples of regular expressions?

There are a lot of examples on the internet. You should especially check this:

15 useful regular expressions in PHP [polish]
regexlib.com - patterns library

I think I have found a bug in Regexp. Where can I report it?

Please submit every found bug by typing comment here (polish and english).

I am a forum user. Can I show pattern test to other users?

Yes. On ID column of every tested expression you can find hiperlink. Copy it and share, that's all.

How can I help develop website?

You can help on following cases:

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By creating website translations. Currently we need this translations: german, spanish, french, italian and russian. If you are interested send me an e-mail
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regexp .pl

regular expressions tester

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Rozwiń listę wyników, aby zobaczyć rezultat testu.

ID	Regular expression	Subject	Result	Matches	Link
101145	^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]{1,})\.([a-zA-Z]{2,}){1}$	jargo@interia.pl	true	jargo@interia.pl pl	Link
101144	/<([a-z]+)([\s]{1}[^=]+[=]{1}[^<]+)(?:>(.)<\/\1>\|\s+\/>)/u	<a href="http://m1chu.eu/" title="m1chu.eu - another devblog">m1chu.eu</a> - <strong>another devblog</strong>	true	<a href="http://m1chu.eu/" title="m1chu.eu - another devblog">m1chu.eu</a> a href="http://m1chu.eu/" title="m1chu.eu - another devblog" m1chu.eu <strong>another devblog</strong> strong another devblog	Link
101143	[a-z]*	Abcą	true		Link
101142	[a-z]*	abcą	true	abc	Link
101141	[a-z]*	abc	true	abc	Link
101140	^.SYMBOL_\d+=\'(\S+).$	SYMBOL_60='ABX 468684 523102'	true	SYMBOL_60='ABX 468684 523102' ABX	Link
101139	index2.exe	{/.[a-z]}	false		Link
101138	index2.exe	/.[a-z]	false		Link
101137	function onmouseover(event) { Tip(/(.*?)/, WIDTH, 350); }	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101136	(function)( )(onmouseover)($)(event)($)( )(\{)( )(Tip)($)(".*?")(,)( WIDTH)(,)( )(350)($)(;)( )(\})	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101135	(function)( )(onmouseover)($)(event)($)( )(\{)( )(Tip)($)(".*?")(,)( WIDTH)(,)( )(350)($)(;)( )(\})	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101134	(function)( )(onmouseover)($)(event)($)( )(\{)( )(Tip)($)(".*?"), WIDTH, 350)($)(;)( )(\})	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101133	/(function)( )(onmouseover)($)(event)($)( )(\{)( )(Tip)($)(".*?")(,)( WIDTH)(,)( )(350)($)(;)( )(\})/	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101132	(function)( )(onmouseover)($)(event)($)( )(\{)( )(Tip)($)(".*?")(,)( WIDTH)(,)( )(350)($)(;)( )(\})	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101131	oplog.log.^([0-4])-([0-2])-([0-2]).gz	oplog.log.2012-02-09.gz	false		Link
101130	oplog.log.^([0-9])-([0-9])-([0-9]).gz	oplog.log.2012-02-09.gz	false		Link
101129	oplog.log./^([0-9])-([0-9])-([0-9]).gz	oplog.log.2012-02-09.gz	false		Link
101128	oplog.log.([0-9])-([0-9])-([0-9]).gz	oplog.log.2012-02-09.gz	false		Link
101127	oplog.log./^([0-9]{2})-([0-9]	oplog.log.2012	false		Link
101126	oplog.log./^([0-9]{2})-([0-9]	oplog.log	false		Link
101125	function onmouseover(event) { Tip((.*?), WIDTH, 350); }	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101124	function onmouseover(event) { Tip((".*?"), WIDTH, 350); }	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101123	".*?"	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	true		Link
101122	/(function)( )(onmouseover)(()(event)())( )({)( )(Tip)(()(".*?")(,)( WIDTH)(,)( )(350)())(;)( )(}) /	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link
101121	(function)( )(onmouseover)(()(event)())( )({)( )(Tip)(()(".*?")(,)( WIDTH)(,)( )(350)())(;)( )(})	function onmouseover(event) { Tip("co to jest", WIDTH, 350); }	false		Link

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