Regular Expressions 101

Save & Manage Regex

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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
Processing...

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 = "(.*?)(\\.|_?)(000\\d{0,})(.*)\\.jpg"; final String string = "test_canon_shot02.jpg \n" + "test_shot01-04.jpg \n" + "test_shot02-03.jpg \n" + "test_shot02-02.jpg \n" + "test_shot01-03.jpg \n" + "test_canon_shot03.jpg \n" + "test_shot01-02.jpg \n" + "test_shot02.jpg\n" + "test_canon_shot02.jpg\n" + "test_shot01.jpg \n" + "GameAssets_.00024.jpg \n" + "GameAssets_.00023.jpg \n" + "GameAssets_.00022.jpg \n" + "GameAssets_.00021.jpg \n" + "GameAssets_.00020.jpg \n" + "GameAssets_.00019.jpg \n" + "GameAssets_.00018.jpg \n" + "GameAssets_.00017.jpg \n" + "GameAssets_.00016.jpg \n" + "GameAssets_.00015.jpg \n" + "GameAssets_.00014.jpg \n" + "GameAssets_.00013.jpg \n" + "GameAssets_.00012.jpg \n" + "GameAssets_.00011.jpg \n" + "GameAssets_.00010.jpg \n" + "GameAssets_.00009.jpg \n" + "GameAssets_.00008.jpg \n" + "GameAssets_.00007.jpg \n" + "GameAssets_.00006.jpg \n" + "GameAssets_.00005.jpg \n" + "GameAssets_.00004.jpg \n" + "GameAssets_.00003.jpg \n" + "GameAssets_.00002.jpg \n" + "GameAssets_.00001.jpg \n" + "GameAssets_.00000.jpg \n" + "OrangeXmas2015_Print_A ct2.jpg \n" + "sh120_HF_V01-01.jpg \n" + "sh120_HF_V01-02.jpg \n" + "sh200_DMP_v04.jpg \n" + "sh120_HF_V04.jpg \n" + "sh120_HF_V03.jpg \n" + "sh120_HF_V02.jpg \n" + "blah_v02.jpg \n" + "blah_v01.jpg \n" + "blah_Capture0 4.jpg \n" + "blah_Capture03 .jpg \n" + "blah_Capture01. jpg \n" + "blah_Capture02.jpg \n" + "Wall_GraniteBlock_G rey_TC041813.jpg\n" + "Renders10_wire.jpg \n" + "Renders10.jpg \n" + "Renders09_wire.jpg \n" + "Renders09.jpg \n" + "Renders08_wire.jpg \n" + "Renders08.jpg \n" + "Renders07_wire.jpg \n" + "Renders07.jpg \n" + "Renders06_wire.jpg \n" + "Renders06.jpg \n" + "Renders05_wire.jpg \n" + "Renders05.jpg \n" + "Renders04_wire.jpg \n" + "Renders04.jpg \n" + "Renders03_wire.jpg \n" + "Renders03.jpg \n" + "Renders02_wire.jpg \n" + "Renders02.jpg \n" + "Renders01_wire.jpg \n" + "Renders01.jpg \n" + "archmodels58_057_carpinusbetulus_leaf_diffuse.jpg \n" + "archmodels58_042_bark_bump.jpg \n" + "archmodels58_023_leaf_diffuse.jpg \n" + "WINDY TECHNICZNE-reflect00.jpg \n" + "archmodels58_057_leaf_opacity.jpg \n" + "archmodels58_057_bark_reflect.jpg \n" + "archmodels58_057_bark_bump.jpg \n" + "blahC-00-oknaka.jpg \n" + "bed \n" + "debt \n" + "cab \n" + "00018.jpg \n" + "00017.jpg \n" + "00016.jpg \n" + "00015.jpg \n" + "00014.jpg \n" + "00013.jpg \n" + "00012.jpg \n" + "00011.jpg \n" + "00010.jpg \n" + "00009.jpg \n" + "00008.jpg \n" + "00007.jpg \n" + "00006.jpg \n" + "00005.jpg \n" + "00004.jpg \n" + "00003.jpg \n" + "00002.jpg \n" + "00001.jpg \n" + "00000.jpg "; 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