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"
"
g

Test String

Substitution

Processing...

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 = "(?s)^.*?\\\"longitude[^\\[]*?\\\"activity[^\\[]*\\[[^\\]]*?timestampMs\\\"[^\\\"\\]]*\\\"(\\d+)\\\"[^\\]]*WALKING[^\\]]*?confidence\\\"\\s*:\\s*(\\b\\d{1,3}\\b)[^\\]]*?\\].*$"; final String string = " }, {\n" + " \"timestampMs\" : \"1515564666086\", ◁― Don't need this but it won't hurt\n" + " \"latitudeE7\" : -6857630899, \n" + " \"longitudeE7\" : -1779694452999,\n" + " \"activity\" : [ {\n" + " \"timestampMs\" : \"1515564665992\", ◁― EXAMPLE: I want only this, and...\n" + " \"activity\" : [ {\n" + " \"type\" : \"STILL\",\n" + " \"confidence\" : 65\n" + " }, {\n" + " \"type\" : \"TILTING\", ↓\n" + " \"confidence\" : 4\n" + " }, {\n" + " \"type\" : \"IN_RAIL_VEHICLE\",\n" + " \"confidence\" : 20\n" + " }, {\n" + " \"type\" : \"IN_ROAD_VEHICLE\",\n" + " \"confidence\" : 5\n" + " }, {\n" + " \"type\" : \"ON_FOOT\", ↓\n" + " \"confidence\" : 3\n" + " }, {\n" + " \"type\" : \"UNKNOWN\",\n" + " \"confidence\" : 3\n" + " }, {\n" + " \"type\" : \"WALKING\", ◁― ...AND, I also want this.\n" + " \"confidence\" : 3\n" + " } ]\n" + " } ]\n" + " }, {\n" + " \"timestampMs\" : \"1515564662594\", ◁― Don't need this but it won't hurt\n" + " \"latitudeE7\" : -6857630899, \n" + " \"longitudeE7\" : -1779694452999,\n" + " \"altitude\" : 42\n" + " }, {"; final String subst = "\\1 \\2"; final Pattern pattern = Pattern.compile(regex); final Matcher matcher = pattern.matcher(string); // The substituted value will be contained in the result variable final String result = matcher.replaceAll(subst); System.out.println("Substitution result: " + result); } }

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