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 = "token=\\K\\S+"; final String string = "207.244.229.206 - - [28/Mar/2022:14:35:32 -0300] \"GET /api_producao.php/procedimento?filter%5B%5D=status,eq,SIM&filter%5B%5D=clinicaId,eq,50&transform=1&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjExMSwiaXNzIjoiaHR0cHM6Ly9zZHJwb3J0by5jb20uYnIvYmFjay9vZG9udG9sb2dpYS9wdWJsaWMvYXBpL3YxL3NpZ25pbiIsImlhdCI6MTY0ODQ4Njk4MCwiZXhwIjoxNjQ4NDkwNTgwLCJuYmYiOjE2NDg0ODY5ODAsImp0aSI6IndsZVNhZ1ppb3VWVUFRb2cifQ.gnAzxxtWNdUY_Ech0Lj5v8TNMvSTOnjLWLHYhY3eMvE HTTP/1.1\" 200 71194 \"-\" \"GuzzleHttp/6.5.5 curl/7.81.0 PHP/7.4.28\"\n" + "207.244.229.206 - - [28/Mar/2022:14:35:32 -0300] \"GET /api_producao.php/salas?filter=clinicaId,eq,50&transform=1&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjExMSwiaXNzIjoiaHR0cHM6Ly9zZHJwb3J0by5jb20uYnIvYmFjay9vZG9udG9sb2dpYS9wdWJsaWMvYXBpL3YxL3NpZ25pbiIsImlhdCI6MTY0ODQ4Njk4MCwiZXhwIjoxNjQ4NDkwNTgwLCJuYmYiOjE2NDg0ODY5ODAsImp0aSI6IndsZVNhZ1ppb3VWVUFRb2cifQ.gnAzxxtWNdUY_Ech0Lj5v8TNMvSTOnjLWLHYhY3eMvE HTTP/1.1\" 200 303 \"-\" \"GuzzleHttp/6.5.5 curl/7.81.0 PHP/7.4.28\"\n" + "207.244.229.206 - - [28/Mar/2022:14:35:32 -0300] \"PUT /api_producao.php/sala_horario/14 HTTP/1.1\" 200 1 \"-\" \"GuzzleHttp/6.5.5 curl/7.81.0 PHP/7.4.28\"\n" + "207.244.229.206 - - [28/Mar/2022:14:35:32 -0300] \"GET /api_producao.php/sala_horario?filter=salaID,eq,15&transform=1&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjExMSwiaXNzIjoiaHR0cHM6Ly9zZHJwb3J0by5jb20uYnIvYmFjay9vZG9udG9sb2dpYS9wdWJsaWMvYXBpL3YxL3NpZ25pbiIsImlhdCI6MTY0ODQ4Njk4MCwiZXhwIjoxNjQ4NDkwNTgwLCJuYmYiOjE2NDg0ODY5ODAsImp0aSI6IndsZVNhZ1ppb3VWVUFRb2cifQ.gnAzxxtWNdUY_Ech0Lj5v8TNMvSTOnjLWLHYhY3eMvE HTTP/1.1\" 200 141 \"-\" \"GuzzleHttp/6.5.5 curl/7.81.0 PHP/7.4.28\"\n" + "207.244.229.206 - - [28/Mar/2022:14:35:33 -0300] \"GET /api_producao.php/aux_clinica_profissional?filter=clinicaId,eq,42&transform=1&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjExMiwiaXNzIjoiaHR0cHM6Ly93d3cuc2RycG9ydG8uY29tLmJyL2JhY2svb2RvbnRvbG9naWEvcHVibGljL2FwaS92MS9zaWduaW4iLCJpYXQiOjE2NDg0ODc1OTksImV4cCI6MTY0ODQ5MTE5OSwibmJmIjoxNjQ4NDg3NTk5LCJqdGkiOiJUZEtqTnlnWWxiZkJmVEpWIn0.ZNIZJtJQS8BbITnkgGL8j-8g7q47nZ7TTdIA2-6s2k4 HTTP/1.1\" 200 2730 \"-\" \"GuzzleHttp/6.5.5 curl/7.81.0 PHP/7.4.28\"\n" + "207.244.229.206 - - [28/Mar/2022:14:35:33 -0300] \"GET /api_producao.php/profissional?filter=id,in,5,0,9,7,51,10,25,24,33,34,48,0,45,27,105,130,115,118,119,124,0,127&transform=1&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjExMiwiaXNzIjoiaHR0cHM6Ly93d3cuc2RycG9ydG8uY29tLmJyL2JhY2svb2RvbnRvbG9naWEvcHVibGljL2FwaS92MS9zaWduaW4iLCJpYXQiOjE2NDg0ODc1OTksImV4cCI6MTY0ODQ5MTE5OSwibmJmIjoxNjQ4NDg3NTk5LCJqdGkiOiJUZEtqTnlnWWxiZkJmVEpWIn0.ZNIZJtJQS8BbITnkgGL8j-8g7q47nZ7TTdIA2-6s2k4 HTTP/1.1\" 200 10827 \"-\" \"GuzzleHttp/6.5.5 curl/7.81.0 PHP/7.4.28\"\n" + "207.244.229.206 - - [28/Mar/2022:14:35:33 -0300] \"GET /api_producao.php/sala_horario?filter=salaID,eq,15&transform=1&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjExMSwiaXNzIjoiaHR0cHM6Ly9zZHJwb3J0by5jb20uYnIvYmFjay9vZG9udG9sb2dpYS9wdWJsaWMvYXBpL3YxL3NpZ25pbiIsImlhdCI6MTY0ODQ4Njk4MCwiZXhwIjoxNjQ4NDkwNTgwLCJuYmYiOjE2NDg0ODY5ODAsImp0aSI6IndsZVNhZ1ppb3VWVUFRb2cifQ.gnAzxxtWNdUY_Ech0Lj5v8TNMvSTOnjLWLHYhY3eMvE HTTP/1.1\" 200 141 \"-\" \"GuzzleHttp/6.5.5 curl/7.81.0 PHP/7.4.28\"'"; 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