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"
"
gsim

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 = "(FACTURA.*?(?!ELECTR))"; final String string = "CLINICA LAS UBNDES S.A. R.U.T.: 93.930.000-7\n" + "HOSPÍ ES IONAMIENTO\n" + "CASA TAL: e e - LAS CONDES - SANTIAGO FACTURA NO AFECTA O\n" + "SP” CLÍNICA SUCURSALES: LO FONTECILLA 4174 - LAS CONDES EXENTA ELECTRONICA\n" + "CHICUREO S/N - COLINA N* 211918\n" + "E LAS CONDES EMILLE ALLAIS £91 - LO BARNECHEA\n" + "CAMINO A VALLE NEVADO 41333 - LO BARNECHEA\n" + "LOS PRESIDENTES $8950 - PEÑALOLEN\n" + "S.l.1. - SANTIAGO ORIENTE\n" + "www.clc.cl\n" + "Fecha Emisión : 08-02-2023 RUT : 10.143.057-K\n" + "Señor(es) : NALLY FERNANDEZ MARIA SOLEDAD\n" + "Dirección : MARTIN DE ZAMORA 6306 Vencimiento\n" + "Ciudad : SANTIAGO Comuna : LAS CONDES\n" + "Giro : ACTIVIDADES NO ESPECIFICADAS Forma de Pago _ : CONTADO\n" + "1.698.196\n" + "DESCRIPCIÓN\n" + "PETCT\n" + "1.698.196\n" + "102001\n" + "cuy SÉ Y\n" + "3 |\n" + "Ss $\n" + "Y OCHO MIL CIE\n" + "SON: UN MILLÓN SEISCIENTOS NOVENTA AEB NENENTA\n" + "SEIS PESOS\n" + "MONTO DSCTO [5 o\n" + "MONTO EXENTO |$ 1.698.196\n" + "1.698.196\n" + "01: j d j sio\n" + "y i We\n" + "Timbre Electronico Sil fique Documento: ww\n" + "Res. 138 de 29-11-2011 Veri\n"; final Pattern pattern = Pattern.compile(regex, Pattern.DOTALL | Pattern.CASE_INSENSITIVE | 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