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

/
/

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 = "\"hash\":\"(.*?)\""; final String string = "[{\"added_on\":1587102956,\"amount_left\":0,\"auto_tmm\":false,\"availability\":-1,\"category\":\"radarr\",\"completed\":1218638934,\"completion_on\":1587108704,\"dl_limit\":-1,\"dlspeed\":0,\"downloaded\":1220894674,\"downloaded_session\":0,\"eta\":8640000,\"f_l_piece_prio\":false,\"force_start\":true,\"hash\":\"87802183fc647548ec6efe18feb16149522f6aa0\",\"last_activity\":1587119220,\"magnet_uri\":\"magnet:?xt=urn:btih:87802183fc647548ec6efe18feb16149522f6aa0&dn=Fantasia%202000%20(1999)%20%5b1080p%5d%20%5bYTS.AG%5d&tr=udp%3a%2f%2ftracker.coppersurfer.tk%3a6969%2fannounce&tr=udp%3a%2f%2f9.rarbg.com%3a2710%2fannounce&tr=udp%3a%2f%2fp4p.arenabg.com%3a1337&tr=udp%3a%2f%2ftracker.leechers-paradise.org%3a6969&tr=udp%3a%2f%2ftracker.internetwarriors.net%3a1337&tr=udp%3a%2f%2ftracker.opentrackr.org%3a1337%2fannounce&tr=udp%3a%2f%2ftracker.zer0day.to%3a1337%2fannounce&tr=udp%3a%2f%2ftracker.leechers-paradise.org%3a6969%2fannounce&tr=udp%3a%2f%2fcoppersurfer.tk%3a6969%2fannounce\",\"max_ratio\":-1,\"max_seeding_time\":-1,\"name\":\"Fantasia 2000 (1999) [1080p] [YTS.AG]\",\"num_complete\":22,\"num_incomplete\":4,\"num_leechs\":0,\"num_seeds\":0,\"priority\":0,\"progress\":1,\"ratio\":0.1782183661159947,\"ratio_limit\":-2,\"save_path\":\"/Volumes/1049/Media/\",\"seeding_time_limit\":-2,\"seen_complete\":1587118087,\"seq_dl\":false,\"size\":1218638934,\"state\":\"forcedUP\",\"super_seeding\":false,\"tags\":\"\",\"time_active\":13224,\"total_size\":1218638934,\"tracker\":\"udp://tracker.coppersurfer.tk:6969/announce\",\"up_limit\":-1,\"uploaded\":217585854,\"uploaded_session\":128831791,\"upspeed\":0}]"; final Pattern pattern = Pattern.compile(regex); final Matcher matcher = pattern.matcher(string); if (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