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

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 = "(?<=Hyperlink\" href=\")((http)(.+?)(\\\"|').*?)"; final String string = "<td style=\"vertical-align: top; width: 375px\"><h1 id=\"H_67e23f29-bb69-46eb-b15c\">00 - <a class=\"Hyperlink\" href=\"http://xxxx.xxxxxxx.com/Management/HyperlinkLoader.aspx?HyperlinkID=c64b7052-4229-4169-b8a2\" class=\"Hyperlink\" onmouseover=\"HyperlinkLoader.showTooltip(event,'c64b7052-4229-4169-b8a2')\" onclick=\"HyperlinkLoader.followHyperlink(event,{'HyperlinkID':'c64b7052-4229-4169-b8a2','ReturnURL':''});return false\">Algemeen</a></h1></td>\n" + "<td style=\"width: 292px; vertical-align: top; background-color: rgb(255, 255, 255); text-align: left\"><a class=\"Hyperlink\" href=\"http://xxxx.xxxxxxx.com/Management/HyperlinkLoader.aspx?HyperlinkID=29517117-26ce-4004-88ed\" class=\"Hyperlink\" onmouseover=\"HyperlinkLoader.showTooltip(event,'29517117-26ce-4004-88ed')\" onclick=\"HyperlinkLoader.followHyperlink(event,{'HyperlinkID':'29517117-26ce-4004-88ed','ReturnURL':''});return false\">Asbestbeheersplan</a></td>\n" + "<td style=\"vertical-align: top; width: 375px\"><h1 id=\"H_f534b7b2-a8f5-41b0-9aa8\">01 - <a class=\"Hyperlink\" href=\"http://xxxx.xxxxxxx.com/Management/HyperlinkLoader.aspx?HyperlinkID=7af55197-d865-4cb2-bb9c\" class=\"Hyperlink\" onmouseover=\"HyperlinkLoader.showTooltip(event,'7af55197-d865-4cb2-bb9c')\" onclick=\"HyperlinkLoader.followHyperlink(event,{'HyperlinkID':'7af55197-d865-4cb2-bb9c','ReturnURL':''});return false\">Voor werken geldende voorwaarden</a></h1></td>"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (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