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 = "(?i)(>[^<\\/\\nA-Za-z]{0,5})\\Qfloat\\E([^>\\/\\nA-Za-z]{0,5}<)"; final String string = "<div>\n" + "<p style=\"text-align: left;\">Style: <span style=\"float: right;\">Casual</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Color: <span style=\"float: right;\">float</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Pattern Type: <span style=\"float: right;\">Letter</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Neckline: <span style=\"float: right;\">Round Neck</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Length: <span style=\"float: right;\">Regular</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Type: <span style=\"float: right;\">Pullovers</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Details: <span style=\"float: right;\">Frill</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Sleeve Length: <span style=\"float: right;\">Long Sleeve</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Sleeve Type: <span style=\"float: right;\">Drop Shoulder</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Season: <span style=\"float: right;\">Spring/Fall</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Composition: <span style=\"float: right;\">5% Spandex</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Composition: <span style=\"float: right;\">95% Polyester</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Fabric: <span style=\"float: right;\">Slight Stretch</span></p>\n" + "</div>\n" + "<div>\n" + "<p style=\"text-align: left;\">Fit Type: <span style=\"float: right;\">Regular Fit</span></p>\n" + "</div>\n" + "<p></p>\n" + "<table border=\"1\">\n" + "<thead>\n" + "<tr>\n" + "<th>size</th>\n" + "<th>Shoulder</th>\n" + "<th>Bust</th>\n" + "<th>Length</th>\n" + "<th>Sleeve Length</th>\n" + "<th>Bicep Length</th>\n" + "<th>Cuff</th>\n" + "</tr>\n" + "</thead>\n" + "<tbody>\n" + "<tr>\n" + "<td>XS</td>\n" + "<td>63 cm</td>\n" + "<td>104 cm</td>\n" + "<td>63 cm</td>\n" + "<td>51 cm</td>\n" + "<td>45 cm</td>\n" + "<td>17 cm</td>\n" + "</tr>\n" + "<tr>\n" + "<td>S</td>\n" + "<td>64 cm</td>\n" + "<td>108 cm</td>\n" + "<td>64 cm</td>\n" + "<td>52 cm</td>\n" + "<td>46 cm</td>\n" + "<td>18 cm</td>\n" + "</tr>\n" + "<tr>\n" + "<td>M</td>\n" + "<td>65 cm</td>\n" + "<td>112 cm</td>\n" + "<td>65 cm</td>\n" + "<td>53 cm</td>\n" + "<td>47 cm</td>\n" + "<td>19 cm</td>\n" + "</tr>\n" + "<tr>\n" + "<td>L</td>\n" + "<td>66 cm</td>\n" + "<td>116 cm</td>\n" + "<td>66 cm</td>\n" + "<td>54 cm</td>\n" + "<td>48 cm</td>\n" + "<td>20 cm</td>\n" + "</tr>\n" + "</tbody>\n" + "</table>"; 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