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 = "^\\$?[0-9]{1,3}(?:,[0-9]{3})*(?:\\.[0-9]+)?$"; final String string = "Here are some test cases that it needs to match\n\n" + "76,249.25\n" + "131,588.00\n" + "7.09\n" + "21.27\n" + "420.42\n" + "54.77\n" + "32.848\n" + "3,056.12\n" + "0.009\n" + "0.01\n" + "32.85\n" + "2,948.59\n" + "$99,249.25\n" + "$9.0000\n" + "$1,800.0000\n" + "$1,000,000\n" + "Here are some test cases that it should not target\n\n" + "666-257-6443\n" + "F1A 5G9\n" + "Bolt, Locating, M8 x 1.25 x 30 L\n" + "Precision Washer, 304 SS, 0.63 OD x 0.31\n" + "Flat Washer 300 Series SS; Pack of 50\n" + "U-SSFAN 0.63-L6.00-F0.75-B0.64-T0.38-SC5.62\n" + "U-CLBUM 0.63-D0.88-L0.875\n" + "U-WSSS 0.38-D0.88-T0.125\n" + "U-BGHK 6002ZZ - H1.50\n" + "U-SSCS 0.38-B0.38\n" + "6412K42\n" + "Std Dowel, 3/8\" x 1-1/2\" Lg, Steel\n" + "2019.07.05\n" + "2092-002.0180\n" + "SHCMG 0.25-L1.00\n" + "280160717"; 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