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
Processing...

Test String

Code Generator

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "(<[^>]+.*?)(onabort|onactivate|onafterprint|onafterupdate|onbeforeactivate|onbeforecopy|onbeforecut|onbeforedeactivate|onbeforeeditfocus|onbeforepaste|onbeforeprint|\n" + " onbeforeunload|onbeforeupdate|onblur|onbounce|oncanplay|oncanplaythrough|oncellchange|onchange|\n" + " onclick|oncontextmenu|oncontrolselect|oncopy|oncuechange|oncut|ondataavailable|ondatasetchanged|\n" + " ondatasetcomplete|ondblclick|ondeactivate|ondrag|ondragend|ondragenter|ondragleave|ondragover|\n" + " ondragstart|ondrop|ondurationchange|onemptied|onended|onerror|onerrorupdate|onfilterchange|\n" + " onfinish|onfocus|onfocusin|onfocusout|onformchange|onforminput|onhashchange|onhelp|oninput|oninvalid,|onkeydown|\n" + " onkeypress|onkeyup|onlayoutcomplete|onload|onloadeddata|onloadedmetadata|onloadstart|\n" + " onlosecapture|onmessage|onmousedown|onmouseenter|onmouseleave|onmousemove|onmouseout|\n" + " onmouseover|onmouseup|onmousewheel|onmove|onmoveend|onmovestart|onoffline|ononline|\n" + " onpagehide|onpageshow|onpaste|onpause|onplay|onplaying|onpopstate|onprogress|\n" + " onpropertychange|onratechange|onreadystatechange|onredo|onreset|onresize|onresizeend|\n" + " onresizestart|onrowenter|onrowexit|onrowsdelete|onrowsinserted|onscroll|onseeked|onseeking|\n" + " onselect|onselectionchange|onselectstart|onshow|onstalled|onstart|onstop|onstorage|onsubmit|\n" + " onsuspend|ontimeupdate|onundo|onunload|onvolumechange|onwaiting)[^>]*>"; final String string = "Aim\n\n" + "To compare the clinical evolution of >70% asymtomatic in-stent restenosis in superficial femoral artery. (SFA) treated with endovascular procedure or conservative treatment.\n\n" + "Methods\n\n" + "Historical cohort study was performed in patients with femoral artery stent with an asymptomatic in-stent restenosis of 70-99%. Two groups: Conservative managment vs endovascular treatment.\n\n" + "In both groups we compared: Limb salvage and critical ischemia or limited claudication free survival rates ( <250m) , from initial stent treatment until the appearance of critical ischemia o major amputation ( Log-Rank, Kaplan Meier).\n\n" + "Primary permeability and assisted primary permeability were analized.\n\n\n" + "Results\n\n" + "From January 2010-December 2015, twenty three >70% in-stent restenosis were diagnosed in 20 patients with an average age of 78 years old (SD 9,6). Average follow-up was of 30,1 months. 12 patients (52,2%) received medical (Aspirin and Statins) and endovascular treatment. 11 patients (47,8%) received only medical treatment without an endovascular procedure.\n\n" + "No difference were seen in limb salvage.\n\n" + "Critical ischemia or limited claudication free survival rates were higher in the conservative treatment group vs endovascular group. (P=0,031)\n\n" + "Primary permeability was 14,2 months ( IC 8,2-20.2). Assisted primary permeability, 65,5 months ( IC 57,4-77,5).\n\n" + "Conclusions\n\n" + "In our experience treatment of severe asymtomatic lesions of in-stent stensosis in SFA does not reduce the risk of amputation, critical ischaemia o limitant claudication. In asymptomatic patients, conservative treatment could be a good option, without increasing the risk in amputation and critical ischema."; final Pattern pattern = Pattern.compile(regex, Pattern.COMMENTS | Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CHARACTER_CLASS); final Matcher matcher = pattern.matcher(string); if (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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