Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "(.*-.*?<br>.*)"; final String string = "<div class=\"post hentry\" itemprop=\"blogPost\" itemscope=\"itemscope\" itemtype=\"http://schema.org/BlogPosting\">\n" + "<meta content=\"http://2.bp.blogspot.com/-Xr8J0BgpT-Y/U0r8PrjYqkI/AAAAAAAAAZs/HqpN2aM1dMM/s1600/IMG_4494.jpg\" itemprop=\"image_url\">\n" + "<meta content=\"4117404407927449930\" itemprop=\"blogId\">\n" + "<meta content=\"4496590050094219863\" itemprop=\"postId\">\n" + "<a name=\"4496590050094219863\"></a>\n" + "<h3 class=\"post-title entry-title\" itemprop=\"name\">\n" + "<a href=\"http://kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html\">Rosół z kaszą jaglaną</a>\n" + "</h3>\n" + "<div style=\"float: none;\">\n" + "<iframe allowtransparency=\"true\" frameborder=\"0\" scrolling=\"no\" src=\"http://www.facebook.com/plugins/like.php?href=http://kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html&amp;send=false&amp;layout=standard&amp;show_faces=false&amp;width=450&amp;action=like&amp;font=arial&amp;colorscheme=light&amp;height=35\" style=\"border:none; overflow:hidden; width:450px; height:35px;\"></iframe>\n" + "</div>\n" + "<div class=\"post-header\">\n" + "<div class=\"post-header-line-1\"></div>\n" + "</div>\n" + "<div class=\"post-body entry-content\" id=\"post-body-4496590050094219863\" itemprop=\"description articleBody\">\n" + "<div style=\"text-align: justify;\">\n" + "Jak mawia Ferdek Kiepski - <i>bez mięsa człowiek daleko nie zajedzie...</i> Oczywiście dzisiejszy wpis nie będzie tematem rozważań na temat prawdziwości lub też nie tego stwierdzenia. Nie zmienia to faktu, że każdy czasem lubi zjeść rosół z kury. :) Rosół jest bombą witaminową doskonałą na przeziębienie, a dodatek w postaci kaszy jaglanej nie tylko urozmaici potrawę, ale także podniesie jej walory zdrowotne. Jak dla mnie ziemniaki oraz wszelkie makarony wymiękają przy kaszy jaglanej. ;)</div>\n" + "<br>\n" + "<div class=\"separator\" style=\"clear: both; text-align: center;\">\n" + "<a href=\"http://2.bp.blogspot.com/-Xr8J0BgpT-Y/U0r8PrjYqkI/AAAAAAAAAZs/HqpN2aM1dMM/s1600/IMG_4494.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img alt=\"Rosół z kaszą jaglaną\" border=\"0\" src=\"http://2.bp.blogspot.com/-Xr8J0BgpT-Y/U0r8PrjYqkI/AAAAAAAAAZs/HqpN2aM1dMM/s1600/IMG_4494.jpg\" height=\"358\" title=\"Rosół z kaszą jaglaną\" width=\"640\"></a></div>\n" + "<br>\n" + "Składniki:<br>\n" + "- kasza jaglana <br>\n" + "- 4-5 udek z kurczaka<br>\n" + "- włoszczyzna: korzeń pietruszki, marchewka, seler, por (ja kupuję gotową w biedronce)<br>\n" + "- cebula<br>\n" + "- natka pietruszki<br>\n" + "- sól<br>\n" + "- pieprz<br>\n" + "- ziele angielskie<br>\n" + "- liść laurowy<br>\n" + "- ok. 2 litry wody<br>\n" + "<br>\n" + "<div class=\"separator\" style=\"clear: both; text-align: center;\">\n" + "<a href=\"http://1.bp.blogspot.com/-MD-NFwHYAVE/U0r8OjOlbEI/AAAAAAAAAZg/sG6n3tuxN2o/s1600/IMG_4458.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img alt=\"Rosół z kaszą jaglaną\" border=\"0\" src=\"http://1.bp.blogspot.com/-MD-NFwHYAVE/U0r8OjOlbEI/AAAAAAAAAZg/sG6n3tuxN2o/s1600/IMG_4458.jpg\" height=\"358\" title=\"Rosół z kaszą jaglaną\" width=\"640\"></a></div>\n" + "<br>\n" + "<div class=\"separator\" style=\"clear: both; text-align: center;\">\n" + "<a href=\"http://2.bp.blogspot.com/-pq7Nvs_5I7Y/U0r8O8pfgLI/AAAAAAAAAZo/qfJja3ewbcg/s1600/IMG_4491.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img alt=\"Rosół z kaszą jaglaną\" border=\"0\" src=\"http://2.bp.blogspot.com/-pq7Nvs_5I7Y/U0r8O8pfgLI/AAAAAAAAAZo/qfJja3ewbcg/s1600/IMG_4491.jpg\" height=\"358\" title=\"Rosół z kaszą jaglaną\" width=\"640\"></a></div>\n" + "<ol style=\"text-align: justify;\">\n" + "<li>Gotujemy kaszę jaglaną na sypko (z dodatkiem soli).</li>\n" + "<li>Myjemy udka i wrzucamy do gara. Zalewamy ok 2 litrami zimnej wody i doprowadzamy do wrzenia. Gotujemy na bardzo małym ogniu. Zbieramy tzw. szumowiny.</li>\n" + "<li>Kroimy warzywa. Seler w kostkę. Marchewkę, korzeń pietruszki, pora w paski. Cebulę kroimy na dwie połówki. Wszystkie warzywa wrzucamy do gara i dalej gotujemy.</li>\n" + "<li>Dodajemy przyprawy - sól, pieprz, liść laurowy, ziele angielskie, natkę pietruszki w całości.</li>\n" + "<li>Pozostawiamy rosół aby \"pyrkał :D\" się przez ok. 1,5 godziny. Jeżeli zbyt mało doprawiliście możecie w międzyczasie dodawać przyprawy i sprawdzać smak.</li>\n" + "<li>Rosół jest gotowy, kiedy zacznie smakować jak rosół i kiedy warzywa będą wystarczająco miękkie. Nie wyrzucamy z rosołu żadnych warzyw. To barbarzyństwo!!!:)</li>\n" + "<li>Przed podaniem, do miseczki wsypujemy kaszę jaglaną, a następnie całość zalewamy gorącym rosołem.</li>\n" + "</ol>\n" + "<div style=\"text-align: justify;\">\n" + "SMACZNEGO! :) </div>\n" + "<br>\n" + "<div class=\"separator\" style=\"clear: both; text-align: center;\">\n" + "<a href=\"http://2.bp.blogspot.com/-Xr8J0BgpT-Y/U0r8PrjYqkI/AAAAAAAAAZ0/6KtSzSwbqYA/s1600/IMG_4494.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img alt=\"Rosół z kaszą jaglaną\" border=\"0\" src=\"http://2.bp.blogspot.com/-Xr8J0BgpT-Y/U0r8PrjYqkI/AAAAAAAAAZ0/6KtSzSwbqYA/s1600/IMG_4494.jpg\" height=\"358\" title=\"Rosół z kaszą jaglaną\" width=\"640\"></a></div>\n" + "<br>\n" + "<br>\n" + "<div style=\"clear: both;\"></div>\n" + "<div id=\"lws_0\"><div class=\"linkwithin_outer\" style=\"margin: 0; border: 0; padding: 0; clear: both; \">\n" + "<div id=\"linkwithin_inner\" class=\"linkwithin_inner\" style=\"\n" + " margin: 0;\n" + " border: 0;\n" + " padding: 0;\n" + " width: 596px;\n" + " \n" + " \">\n" + " <div class=\"linkwithin_text\" id=\"linkwithin_text_0\" style=\"\n" + " margin: 0;\n" + " border: 0;\n" + " padding: 20px 0 5px;\n" + " text-align: left;\n" + " font-weight: bold;\n" + " \">Inne dania z kaszą:</div>\n\n" + " <div class=\"linkwithin_posts\" id=\"linkwithin_posts_0\" style=\"margin: 0; border: 0; padding: 0\">\n" + " \n\n\n" + "<a name=\"linkwithin_link_0\" href=\"http://kaszomania.blogspot.com/2014/03/kasza-jaglana-z-warzywami-na-patelnie.html\" onmousedown=\"this.href='http://widget6.linkwithin.com/redirect?url=http%3A//kaszomania.blogspot.com/2014/03/kasza-jaglana-z-warzywami-na-patelnie.html&amp;rtype=&amp;vars=%5B%22http%3A//kaszomania.blogspot.com/search/label/zupy%22%2C%202065963%2C%200%2C%20%22http%3A//kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html%22%2C%20383537545%2C%200%2C%20383537563%5D&amp;ts=' + (new Date()).getTime(); return true;\" style=\"\n" + " display: block;\n" + " float: left;\n\n" + " \n" + " border-bottom: none;\n\n" + " \n\n" + " margin: 0;\n" + " padding: 6px;\n" + " text-decoration: none;\n" + " text-align: left;\n" + " cursor: pointer;\n" + " \" onmouseover=\"this.style.backgroundColor='#dde'\" onmouseout=\"this.style.backgroundColor=''\">\n" + "<div style=\"width: 106px; height: 165px; margin: 0; border: 0; padding: 0\">\n\n" + "<div class=\"linkwithin_img_0\" style=\"\n" + " margin: 0;\n" + " border: 1px solid #ddd;\n" + " padding: 2px;\n" + " width: auto;\n" + " height: auto;\n" + " \">\n\n" + " <div style=\"background: url(http://images3.linkwithin.com/images/383537563.jpg) no-repeat; width: 100px; height: 100px; margin: 0; border: 0; padding: 0\"></div>\n\n\n" + "</div>\n\n" + "<div class=\"linkwithin_title linkwithin_title_0\" style=\"margin: 3px 0px 0px; border: 0px; padding: 0px; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-family: arial; color: rgb(102, 102, 102);\">\n" + " Kasza jaglana z warzywami na patelnię\n" + "</div>\n\n" + "</div>\n" + "</a>\n\n" + "<a name=\"linkwithin_link_0\" href=\"http://kaszomania.blogspot.com/2014/01/saatka-z-kaszy-jaglanej-i-ososia.html\" onmousedown=\"this.href='http://widget6.linkwithin.com/redirect?url=http%3A//kaszomania.blogspot.com/2014/01/saatka-z-kaszy-jaglanej-i-ososia.html&amp;rtype=&amp;vars=%5B%22http%3A//kaszomania.blogspot.com/search/label/zupy%22%2C%202065963%2C%200%2C%20%22http%3A//kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html%22%2C%20383537545%2C%201%2C%20352602665%5D&amp;ts=' + (new Date()).getTime(); return true;\" style=\"\n" + " display: block;\n" + " float: left;\n\n" + " \n" + " border-left: 1px solid #ddd;\n" + " \n" + " border-bottom: none;\n\n" + " \n\n" + " margin: 0;\n" + " padding: 6px;\n" + " text-decoration: none;\n" + " text-align: left;\n" + " cursor: pointer;\n" + " \" onmouseover=\"this.style.backgroundColor='#dde'\" onmouseout=\"this.style.backgroundColor=''\">\n" + "<div style=\"width: 106px; height: 165px; margin: 0; border: 0; padding: 0\">\n\n" + "<div class=\"linkwithin_img_0\" style=\"\n" + " margin: 0;\n" + " border: 1px solid #ddd;\n" + " padding: 2px;\n" + " width: auto;\n" + " height: auto;\n" + " \">\n\n" + " <div style=\"background: url(http://images3.linkwithin.com/images/352602665.jpg) no-repeat; width: 100px; height: 100px; margin: 0; border: 0; padding: 0\"></div>\n\n\n" + "</div>\n\n" + "<div class=\"linkwithin_title linkwithin_title_0\" style=\"margin: 3px 0px 0px; border: 0px; padding: 0px; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-family: arial; color: rgb(102, 102, 102);\">\n" + " Sałatka z kaszy jaglanej i łososia\n" + "</div>\n\n" + "</div>\n" + "</a>\n\n" + "<a name=\"linkwithin_link_0\" href=\"http://kaszomania.blogspot.com/2014/03/kasza-jaglana-z-bananowym-gulaszem.html\" onmousedown=\"this.href='http://widget6.linkwithin.com/redirect?url=http%3A//kaszomania.blogspot.com/2014/03/kasza-jaglana-z-bananowym-gulaszem.html&amp;rtype=&amp;vars=%5B%22http%3A//kaszomania.blogspot.com/search/label/zupy%22%2C%202065963%2C%200%2C%20%22http%3A//kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html%22%2C%20383537545%2C%202%2C%20383537567%5D&amp;ts=' + (new Date()).getTime(); return true;\" style=\"\n" + " display: block;\n" + " float: left;\n\n" + " \n" + " border-left: 1px solid #ddd;\n" + " \n" + " border-bottom: none;\n\n" + " \n\n" + " margin: 0;\n" + " padding: 6px;\n" + " text-decoration: none;\n" + " text-align: left;\n" + " cursor: pointer;\n" + " \" onmouseover=\"this.style.backgroundColor='#dde'\" onmouseout=\"this.style.backgroundColor=''\">\n" + "<div style=\"width: 106px; height: 165px; margin: 0; border: 0; padding: 0\">\n\n" + "<div class=\"linkwithin_img_0\" style=\"\n" + " margin: 0;\n" + " border: 1px solid #ddd;\n" + " padding: 2px;\n" + " width: auto;\n" + " height: auto;\n" + " \">\n\n" + " <div style=\"background: url(http://images3.linkwithin.com/images/383537567.jpg) no-repeat; width: 100px; height: 100px; margin: 0; border: 0; padding: 0\"></div>\n\n\n" + "</div>\n\n" + "<div class=\"linkwithin_title linkwithin_title_0\" style=\"margin: 3px 0px 0px; border: 0px; padding: 0px; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-family: arial; color: rgb(102, 102, 102);\">\n" + " Kasza jaglana z bananowym gulaszem\n" + "</div>\n\n" + "</div>\n" + "</a>\n\n" + "<a name=\"linkwithin_link_0\" href=\"http://kaszomania.blogspot.com/2014/02/zupa-krem-z-kaszy-jaglanej-i-szpinaku.html\" onmousedown=\"this.href='http://widget6.linkwithin.com/redirect?url=http%3A//kaszomania.blogspot.com/2014/02/zupa-krem-z-kaszy-jaglanej-i-szpinaku.html&amp;rtype=&amp;vars=%5B%22http%3A//kaszomania.blogspot.com/search/label/zupy%22%2C%202065963%2C%200%2C%20%22http%3A//kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html%22%2C%20383537545%2C%203%2C%20383537577%5D&amp;ts=' + (new Date()).getTime(); return true;\" style=\"\n" + " display: block;\n" + " float: left;\n\n" + " \n" + " border-left: 1px solid #ddd;\n" + " \n" + " border-bottom: none;\n\n" + " \n\n" + " margin: 0;\n" + " padding: 6px;\n" + " text-decoration: none;\n" + " text-align: left;\n" + " cursor: pointer;\n" + " \" onmouseover=\"this.style.backgroundColor='#dde'\" onmouseout=\"this.style.backgroundColor=''\">\n" + "<div style=\"width: 106px; height: 165px; margin: 0; border: 0; padding: 0\">\n\n" + "<div class=\"linkwithin_img_0\" style=\"\n" + " margin: 0;\n" + " border: 1px solid #ddd;\n" + " padding: 2px;\n" + " width: auto;\n" + " height: auto;\n" + " \">\n\n" + " <div style=\"background: url(http://images3.linkwithin.com/images/383537577.jpg) no-repeat; width: 100px; height: 100px; margin: 0; border: 0; padding: 0\"></div>\n\n\n" + "</div>\n\n" + "<div class=\"linkwithin_title linkwithin_title_0\" style=\"margin: 3px 0px 0px; border: 0px; padding: 0px; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-family: arial; color: rgb(102, 102, 102);\">\n" + " Zupa krem z kaszy jaglanej i szpinaku\n" + "</div>\n\n" + "</div>\n" + "</a>\n\n" + "<a name=\"linkwithin_link_0\" href=\"http://kaszomania.blogspot.com/2014/01/zupa-krem-z-kukurydzy-i-kaszy-jaglanej.html\" id=\"linkwithin_link_last\" onmousedown=\"this.href='http://widget6.linkwithin.com/redirect?url=http%3A//kaszomania.blogspot.com/2014/01/zupa-krem-z-kukurydzy-i-kaszy-jaglanej.html&amp;rtype=&amp;vars=%5B%22http%3A//kaszomania.blogspot.com/search/label/zupy%22%2C%202065963%2C%200%2C%20%22http%3A//kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html%22%2C%20383537545%2C%204%2C%20383537619%5D&amp;ts=' + (new Date()).getTime(); return true;\" style=\"\n" + " display: block;\n" + " float: left;\n\n" + " \n" + " border-left: 1px solid #ddd;\n" + " \n" + " border-bottom: none;\n\n" + " \n\n" + " margin: 0;\n" + " padding: 6px;\n" + " text-decoration: none;\n" + " text-align: left;\n" + " cursor: pointer;\n" + " \" onmouseover=\"this.style.backgroundColor='#dde'\" onmouseout=\"this.style.backgroundColor=''\">\n" + "<div style=\"width: 106px; height: 165px; margin: 0; border: 0; padding: 0\">\n\n" + "<div class=\"linkwithin_img_0\" style=\"\n" + " margin: 0;\n" + " border: 1px solid #ddd;\n" + " padding: 2px;\n" + " width: auto;\n" + " height: auto;\n" + " \">\n\n" + " <div style=\"background: url(http://images3.linkwithin.com/images/383537619.jpg) no-repeat; width: 100px; height: 100px; margin: 0; border: 0; padding: 0\"></div>\n\n\n" + "</div>\n\n" + "<div class=\"linkwithin_title linkwithin_title_0\" style=\"margin: 3px 0px 0px; border: 0px; padding: 0px; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-family: arial; color: rgb(102, 102, 102);\">\n" + " Zupa krem z kukurydzy i kaszy jaglanej\n" + "</div>\n\n" + "</div>\n" + "</a>\n\n\n\n" + " </div>\n\n" + " <div id=\"linkwithin_logo_0\" style=\"\n" + " clear: both;\n" + " margin: 0 0 20px 0;\n" + " border: 0;\n" + " padding: 5px 6px 0 0;\n" + " text-align: right;\n" + " \">\n" + " <a id=\"linkwithin_logolink_0\" href=\"http://www.linkwithin.com/learn?ref=widget\" style=\"\n" + " font: 10px arial;\n" + " color: #bbb;\n" + " text-decoration: none;\n" + " border-bottom: none;\n" + " \" onmouseover=\"this.style.textDecoration='underline'\" onmouseout=\"this.style.textDecoration='none'\" target=\"_blank\">Linkwithin</a>\n" + " </div>\n" + "</div>\n" + "</div></div></div>\n" + "<div class=\"post-footer\">\n" + "<div class=\"post-footer-line post-footer-line-1\"><span class=\"post-author vcard\">\n" + "Autor:\n" + "<span class=\"fn\" itemprop=\"author\" itemscope=\"itemscope\" itemtype=\"http://schema.org/Person\">\n" + "<meta content=\"http://www.blogger.com/profile/07377519070516761764\" itemprop=\"url\">\n" + "<a class=\"g-profile\" href=\"http://www.blogger.com/profile/07377519070516761764\" rel=\"author\" title=\"author profile\" data-gapiscan=\"true\" data-onload=\"true\" data-gapiattached=\"true\">\n" + "<span itemprop=\"name\">Kaszomaniak</span>\n" + "</a>\n" + "</span>\n" + "</span>\n" + "<span class=\"post-timestamp\">\n" + "o\n" + "<meta content=\"http://kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html\" itemprop=\"url\">\n" + "<a class=\"timestamp-link\" href=\"http://kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html\" rel=\"bookmark\" title=\"permanent link\"><abbr class=\"published\" itemprop=\"datePublished\" title=\"2014-04-14T19:00:00+02:00\">19:00</abbr></a>\n" + "</span>\n" + "<span class=\"post-comment-link\">\n" + "<a class=\"comment-link\" href=\"http://kaszomania.blogspot.com/2014/04/roso-z-kasza-jaglana.html#comment-form\" onclick=\"\">\n" + "2 komentarze:\n" + " </a>\n" + "</span>\n" + "<span class=\"post-icons\">\n" + "<span class=\"item-control blog-admin pid-56923570\">\n" + "<a href=\"http://www.blogger.com/post-edit.g?blogID=4117404407927449930&amp;postID=4496590050094219863&amp;from=pencil\" title=\"Edytuj post\">\n" + "<img alt=\"\" class=\"icon-action\" height=\"18\" src=\"http://img2.blogblog.com/img/icon18_edit_allbkg.gif\" width=\"18\">\n" + "</a>\n" + "</span>\n" + "</span>\n" + "<div class=\"post-share-buttons goog-inline-block\">\n" + "<a class=\"goog-inline-block share-button sb-email\" href=\"http://www.blogger.com/share-post.g?blogID=4117404407927449930&amp;postID=4496590050094219863&amp;target=email\" target=\"_blank\" title=\"Wyślij pocztą e-mail\"><span class=\"share-button-link-text\">Wyślij pocztą e-mail</span></a><a class=\"goog-inline-block share-button sb-blog\" href=\"http://www.blogger.com/share-post.g?blogID=4117404407927449930&amp;postID=4496590050094219863&amp;target=blog\" onclick=\"window.open(this.href, &quot;_blank&quot;, &quot;height=270,width=475&quot;); 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final String subst = "$1"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); // The substituted value will be contained in the result variable final String result = matcher.replaceAll(subst); System.out.println("Substitution result: " + result); } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html