Regular Expressions 101

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Function

  • Match
  • Substitution
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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]
  • Character class intersection
    [\w&&[^\d]]
  • 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 = "((?:\\ud83c\\udde8\\ud83c\\uddf3|\\ud83c\\uddfa\\ud83c\\uddf8|\\ud83c\\uddf7\\ud83c\\uddfa|\\ud83c\\uddf0\\ud83c\\uddf7|\\ud83c\\uddef\\ud83c\\uddf5|\\ud83c\\uddee\\ud83c\\uddf9|\\ud83c\\uddec\\ud83c\\udde7|\\ud83c\\uddeb\\ud83c\\uddf7|\\ud83c\\uddea\\ud83c\\uddf8|\\ud83c\\udde9\\ud83c\\uddea|\\u0039\\ufe0f?\\u20e3|\\u0038\\ufe0f?\\u20e3|\\u0037\\ufe0f?\\u20e3|\\u0036\\ufe0f?\\u20e3|\\u0035\\ufe0f?\\u20e3|\\u0034\\ufe0f?\\u20e3|\\u0033\\ufe0f?\\u20e3|\\u0032\\ufe0f?\\u20e3|\\u0031\\ufe0f?\\u20e3|\\u0030\\ufe0f?\\u20e3|\\u0023\\ufe0f?\\u20e3|\\ud83d\\udeb3|\\ud83d\\udeb1|\\ud83d\\udeb0|\\ud83d\\udeaf|\\ud83d\\udeae|\\ud83d\\udea6|\\ud83d\\udea3|\\ud83d\\udea1|\\ud83d\\udea0|\\ud83d\\ude9f|\\ud83d\\ude9e|\\ud83d\\ude9d|\\ud83d\\ude9c|\\ud83d\\ude9b|\\ud83d\\ude98|\\ud83d\\ude96|\\ud83d\\ude94|\\ud83d\\ude90|\\ud83d\\ude8e|\\ud83d\\ude8d|\\ud83d\\ude8b|\\ud83d\\ude8a|\\ud83d\\ude88|\\ud83d\\ude86|\\ud83d\\ude82|\\ud83d\\ude81|\\ud83d\\ude36|\\ud83d\\ude34|\\ud83d\\ude2f|\\ud83d\\ude2e|\\ud83d\\ude2c|\\ud83d\\ude27|\\ud83d\\ude26|\\ud83d\\ude1f|\\ud83d\\ude1b|\\ud83d\\ude19|\\ud83d\\ude17|\\ud83d\\ude15|\\ud83d\\ude11|\\ud83d\\ude10|\\ud83d\\ude0e|\\ud83d\\ude08|\\ud83d\\ude07|\\ud83d\\ude00|\\ud83d\\udd67|\\ud83d\\udd66|\\ud83d\\udd65|\\ud83d\\udd64|\\ud83d\\udd63|\\ud83d\\udd62|\\ud83d\\udd61|\\ud83d\\udd60|\\ud83d\\udd5f|\\ud83d\\udd5e|\\ud83d\\udd5d|\\ud83d\\udd5c|\\ud83d\\udd2d|\\ud83d\\udd2c|\\ud83d\\udd15|\\ud83d\\udd09|\\ud83d\\udd08|\\ud83d\\udd07|\\ud83d\\udd06|\\ud83d\\udd05|\\ud83d\\udd04|\\ud83d\\udd02|\\ud83d\\udd01|\\ud83d\\udd00|\\ud83d\\udcf5|\\ud83d\\udcef|\\ud83d\\udced|\\ud83d\\udcec|\\ud83d\\udcb7|\\ud83d\\udcb6|\\ud83d\\udcad|\\ud83d\\udc6d|\\ud83d\\udc6c|\\ud83d\\udc65|\\ud83d\\udc2a|\\ud83d\\udc16|\\ud83d\\udc15|\\ud83d\\udc13|\\ud83d\\udc10|\\ud83d\\udc0f|\\ud83d\\udc0b|\\ud83d\\udc0a|\\ud83d\\udc09|\\ud83d\\udc08|\\ud83d\\udc07|\\ud83d\\udc06|\\ud83d\\udc05|\\ud83d\\udc04|\\ud83d\\udc03|\\ud83d\\udc02|\\ud83d\\udc01|\\ud83d\\udc00|\\ud83c\\udfe4|\\ud83c\\udfc9|\\ud83c\\udfc7|\\ud83c\\udf7c|\\ud83c\\udf50|\\ud83c\\udf4b|\\ud83c\\udf33|\\ud83c\\udf32|\\ud83c\\udf1e|\\ud83c\\udf1d|\\ud83c\\udf1c|\\ud83c\\udf1a|\\ud83c\\udf18|\\ud83c\\udccf|\\ud83c\\udd8e|\\ud83c\\udd91|\\ud83c\\udd92|\\ud83c\\udd93|\\ud83c\\udd94|\\ud83c\\udd95|\\ud83c\\udd96|\\ud83c\\udd97|\\ud83c\\udd98|\\ud83c\\udd99|\\ud83c\\udd9a|\\ud83d\\udc77|\\ud83d\\udec5|\\ud83d\\udec4|\\ud83d\\udec3|\\ud83d\\udec2|\\ud83d\\udec1|\\ud83d\\udebf|\\ud83d\\udeb8|\\ud83d\\udeb7|\\ud83d\\udeb5|\\ud83c\\ude01|\\ud83c\\ude32|\\ud83c\\ude33|\\ud83c\\ude34|\\ud83c\\ude35|\\ud83c\\ude36|\\ud83c\\ude38|\\ud83c\\ude39|\\ud83c\\ude3a|\\ud83c\\ude50|\\ud83c\\ude51|\\ud83c\\udf00|\\ud83c\\udf01|\\ud83c\\udf02|\\ud83c\\udf03|\\ud83c\\udf04|\\ud83c\\udf05|\\ud83c\\udf06|\\ud83c\\udf07|\\ud83c\\udf08|\\ud83c\\udf09|\\ud83c\\udf0a|\\ud83c\\udf0b|\\ud83c\\udf0c|\\ud83c\\udf0f|\\ud83c\\udf11|\\ud83c\\udf13|\\ud83c\\udf14|\\ud83c\\udf15|\\ud83c\\udf19|\\ud83c\\udf1b|\\ud83c\\udf1f|\\ud83c\\udf20|\\ud83c\\udf30|\\ud83c\\udf31|\\ud83c\\udf34|\\ud83c\\udf35|\\ud83c\\udf37|\\ud83c\\udf38|\\ud83c\\udf39|\\ud83c\\udf3a|\\ud83c\\udf3b|\\ud83c\\udf3c|\\ud83c\\udf3d|\\ud83c\\udf3e|\\ud83c\\udf3f|\\ud83c\\udf40|\\ud83c\\udf41|\\ud83c\\udf42|\\ud83c\\udf43|\\ud83c\\udf44|\\ud83c\\udf45|\\ud83c\\udf46|\\ud83c\\udf47|\\ud83c\\udf48|\\ud83c\\udf49|\\ud83c\\udf4a|\\ud83c\\udf4c|\\ud83c\\udf4d|\\ud83c\\udf4e|\\ud83c\\udf4f|\\ud83c\\udf51|\\ud83c\\udf52|\\ud83c\\udf53|\\ud83c\\udf54|\\ud83c\\udf55|\\ud83c\\udf56|\\ud83c\\udf57|\\ud83c\\udf58|\\ud83c\\udf59|\\ud83c\\udf5a|\\ud83c\\udf5b|\\ud83c\\udf5c|\\ud83c\\udf5d|\\ud83c\\udf5e|\\ud83c\\udf5f|\\ud83c\\udf60|\\ud83c\\udf61|\\ud83c\\udf62|\\ud83c\\udf63|\\ud83c\\udf64|\\ud83c\\udf65|\\ud83c\\udf66|\\ud83c\\udf67|\\ud83c\\udf68|\\ud83c\\udf69|\\ud83c\\udf6a|\\ud83c\\udf6b|\\ud83c\\udf6c|\\ud83c\\udf6d|\\ud83c\\udf6e|\\ud83c\\udf6f|\\ud83c\\udf70|\\ud83c\\udf71|\\ud83c\\udf72|\\ud83c\\udf73|\\ud83c\\udf74|\\ud83c\\udf75|\\ud83c\\udf76|\\ud83c\\udf77|\\ud83c\\udf78|\\ud83c\\udf79|\\ud83c\\udf7a|\\ud83c\\udf7b|\\ud83c\\udf80|\\ud83c\\udf81|\\ud83c\\udf82|\\ud83c\\udf83|\\ud83c\\udf84|\\ud83c\\udf85|\\ud83c\\udf86|\\ud83c\\udf87|\\ud83c\\udf88|\\ud83c\\udf89|\\ud83c\\udf8a|\\ud83c\\udf8b|\\ud83c\\udf8c|\\ud83c\\udf8d|\\ud83c\\udf8e|\\ud83c\\udf8f|\\ud83c\\udf90|\\ud83c\\udf91|\\ud83c\\udf92|\\ud83c\\udf93|\\ud83c\\udfa0|\\ud83c\\udfa1|\\ud83c\\udfa2|\\ud83c\\udfa3|\\ud83c\\udfa4|\\ud83c\\udfa5|\\ud83c\\udfa6|\\ud83c\\udfa7|\\ud83c\\udfa8|\\ud83c\\udfa9|\\ud83c\\udfaa|\\ud83c\\udfab|\\ud83c\\udfac|\\ud83c\\udfad|\\ud83c\\udfae|\\ud83c\\udfaf|\\ud83c\\udfb0|\\ud83c\\udfb1|\\ud83c\\udfb2|\\ud83c\\udfb3|\\ud83c\\udfb4|\\ud83c\\udfb5|\\ud83c\\udfb6|\\ud83c\\udfb7|\\ud83c\\udfb8|\\ud83c\\udfb9|\\ud83c\\udfba|\\ud83c\\udfbb|\\ud83c\\udfbc|\\ud83c\\udfbd|\\ud83c\\udfbe|\\ud83c\\udfbf|\\ud83c\\udfc0|\\ud83c\\udfc1|\\ud83c\\udfc2|\\ud83c\\udfc3|\\ud83c\\udfc4|\\ud83c\\udfc6|\\ud83c\\udfc8|\\ud83c\\udfca|\\ud83c\\udfe0|\\ud83c\\udf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final String string = " : 😁wew😁 c"; 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