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 = "^[A-Z\\d]+\\s+\\d{4}-\\d{2}-\\d{2}\\s+\\w+(?:[ -]\\w+)*\\s+\\S+\\s+\\S+\\s+(\\S+)"; final String string = "2020-08-26 PILE OF LIFE HEALTH PRODUCTS LP Page 1 A/P Remittance Advice Direct Deposit 2020-08-26\n\n" + "Cheque # 11361 Vendor # 0828 HAIN CELESTIAL CANADA, ULC\n\n" + "Invoice # Date Description Gross Disc Net\n" + "===============================================================\n\n" + "225299 2020-07-24 P2156678 7,610.52 .00 7,610.52 \n" + "225839 2020-07-22 P2157105 7,826.28 .00 7,826.28 \n" + "225969 2020-07-22 P2157106 8,760.59 .00 8,760.59 \n" + "226384 2020-07-22 P2157104 42,274.76 .00 42,274.76\n" + "CR01BEPJ 2020-08-17 MULTI MCBS 4,470.06- .00 4,470.06-\n" + "CR01BEXS 2020-08-24 MULTI MCBS 5,212.81- .00 5,212.81-\n\n" + "DM20082311 2020-08-14 LIFESTYLE MARKETS NA 201.25- .00 201.25-\n" + "DM20083583 2020-08-17 KARDISH FOOD FRANCHI 281.37- .00 281.37-\n" + "DM20085965 2020-08-12 AVRILSUPERMARCHE-WAR 871.50- .00 871.50-\n" + "DM20086678 2020-08-12 AVRILSUPERMARCHE-WAR 871.50- .00 871.50-\n" + "DM20089459 2020-07-30 LOBLAWS 8.90- .00 8.90- \n" + "DM20089500 2020-08-14 COUNTRY GROCER-CHASE 105.00- .00 105.00-\n\n" + "========================================== 54,449.76 .00 54,449.76\n\n" + "Printed on 2020-08-26 at 6:26\n\n" + "2020-04-23 PILE OF LIFE HEALTH PRODUCTS LP Page 1 A/P Remittance Advice Direct Deposit 2020-04-23\n\n" + "Cheque # 9699 Vendor # 0828 HAIN CELESTIAL CANADA, ULC\n\n" + "Invoice # Date Description Gross Disc Net ===================================================================================\n\n" + "218124 2020-02-27 P2151168 2,253.44 .00 2,253.44 \n" + "219021 2020-03-18 P2152030 35,242.65 .00 35,242.65\n" + "219216 2020-03-18 P2152031 8,306.81 .00 8,306.81 \n" + "CR01BASW 2020-04-20 MULTI MCBS 5,278.05- .00 5,278.05-\n\n" + "DM2004W450 2020-04-17 RETURNS WFM-GR-20589 124.63- .00 124.63-\n" + "DM2004W828 2020-04-17 RETURNS WFM-GR-20589 266.09- .00 266.09-\n" + "DM20042157 2020-04-07 AVRIL 871.50- .00 871.50-\n" + "DM20043798 2020-04-07 COUNTRY GROCER 105.00- .00 105.00-\n" + "DM20043892 2020-04-07 COUNTRY GROCER 105.00- .00 105.00-\n" + "DM20048663 2020-04-07 AVRIL 871.50- .00 871.50-\n" + "DM20049986 2020-04-02 LA MOISSON 258.69- .00 258.69-\n\n" + "========================================== 37,922.44 .00 37,922.44\n\n" + "Printed on 2020-04-23 at 13:13"; 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