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

r"
"
g

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 = "(?ms)^AELIST.*?(?=^[A-Z]|\\Z)"; final String string = "AELIST 1 5159 5160 7007 7008 7015 7016 7023+ \n" + "+ 7024 7031 7032 7039 7040 7047 7048 7055+ \n" + "+ 7056 7063 7064 7071 7072 7079 7080 7087+ \n" + "+ 7088 7095 7096 7103 7104 7111 7112 7119+ \n" + "+ 7120 7127 7128 7135 7136 7143 7144 7151+ \n" + "+ 7152 7159 7160 7167 7168 7175 7176 7183+ \n" + "+ 7184 7191 7192 7199 7200 7207 7208 7215+ \n" + "+ 7216 7223 7224 7231 7232 \n" + "SET1 2 6159 6160 9007 9008 9015 9016 9023+ \n" + "+ 9024 9031 9032 9039 9040 9047 9048 9055+ \n" + "+ 9056 9063 9064 9071 9072 9079 9080 9087+ \n" + "+ 9088 9095 9096 9103 9104 9111 9112 9119+ \n" + "+ 9120 9127 9128 9135 9136 9143 9144 9151+ \n" + "+ 9152 9159 9160 \n" + "AELIST 5 11017 11018 11023 11024 11029 11030 11035+ \n" + "+ 11036 11041 11042 11047 11048 11053 11054 11059+ \n" + "+ 11060 11065 11066 11071 11072 11077 11078 11083+ \n" + "+ 11084 11089 11090 11095 11096 11101 11102 11107+ "; final Pattern pattern = Pattern.compile(regex); 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