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 single character of: a, b, c or d
    [[ab][cd]]
  • 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
No Match

"
"
gm

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 = "(?<pref>京都府)?\\s*(?<city>京都市)\\s*(?<ward>[上中下左右]京区|東山区|南区)\\s*(?<street>(?!太秦安井柳通町|嵯峨中通町)(?:(?:[一-龠々ぁ-んァ-ンノ]+(?:通|筋|小路)|[一二三四五六七八九十百千]+(?:筋|本)目|[一二三四五六七八九十百千]+丁目|[東西南北]入(?:[るルﾙ])?|[東西南北](?:裏|側)|[上下](?!丸屋町|材木町|柳町)(?:[るルﾙ]|がる)?|[一-龠々ぁ-んァ-ンノ]+(?=\\s*(?:[東西南北]入|[上下](?:[るルﾙ]|がる)?)))\\s*)+)?(?<town>.+)"; final String string = "京都府京都市上京区室町通一条上る小島町123-4\n" + "京都府京都市上京区今出川通室町西入ル紙屋川町345-5\n" + "京都府京都市上京区新町通丸太町下る春帯町678-6\n" + "京都府京都市中京区烏丸通御池下る饅頭屋町789-7\n" + "京都府京都市中京区三条通河原町東入ル中島町101-8\n" + "京都府京都市中京区御幸町通錦小路上ル船屋町202-9\n" + "京都府京都市中京区麸屋町通六角下る坂井町303-10\n" + "京都府京都市下京区四条通柳馬場西入ル立売西町404-11\n" + "京都府京都市下京区松原通西洞院東入ル本塩竈町505-12\n" + "京都府京都市下京区花屋町通松原上る柿本町606-13\n" + "京都府京都市左京区東大路通仁王門下る東門前町707-14\n" + "京都府京都市左京区北大路通下鴨本通西入ル下鴨前萩町808-15\n" + "京都府京都市左京区白川通今出川上る石橋町909-16\n" + "京都府京都市右京区西大路通御池下る西小路町111-17\n" + "京都府京都市上京区大宮通寺之内上る二丁目西入社横町２８８\n" + "京都府京都市上京区大宮通寺之内下る花開院町１２６\n" + "京都府京都市中京区寺町通三条上る天性寺前町５３５\n" + "京都府京都市下京区烏丸通七条下る東塩小路町５９０−２\n" + "京都府京都市中京区寺町通六角上る桜之町426番地\n" + "京都府京都市下京区四条通室町東入函谷鉾町78番地\n" + "京都府京都市上京区上ノ下立売通紙屋川東入堀川町５２７−２６\n" + "京都府京都市東山区鞘町通正面下る上堀詰町２６５\n" + "京都府京都市下京区松原通西洞院東入藪下町２\n" + "京都府京都市下京区東中筋通花屋町下る柳町３３５−３\n" + "京都府京都市下京区東洞院通四条下る元悪王子町４７−４\n" + "京都市中京区河原町通姉小路上ル下丸屋町408\n" + "京都市下京区木屋町五条上がる下材木町 447\n" + "京都府京都市右京区太秦安井柳通町1-1番地の4\n" + "京都府京都市右京区嵯峨中通町1-1番地の4\n" + "京都府京都市下京区六条通烏丸西入上柳町1-1番地の4\n" + "京都府京都市上京区中筋通智恵光院西入菱屋町1-1番地の4\n"; final String subst = "${pref}${city}${ward}${town}"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); 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