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
Processing...

Test String

Code Generator

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "[A-HJ-NPR-Z]{17}"; final String string = "OXCIHKMBLPRQNTZWI\n" + "BQPUFWZDSDNUUKIUV\n" + "BVVXVWVCOASEASPWU\n" + "DCZACWJCZUWLBIVUI\n" + "KFLCKCAXUAZNKJVWR\n" + "QOOCGWILRYKYQTENT\n" + "YDSNHLBUHOACQBZUK\n" + "JAKUCQVYQKZFWRXWC\n" + "YNNXLIUQBJYAAGFKR\n" + "NTYAJLVNQDPMNIROG\n" + "QOAEGBNELNDIKQOWE\n" + "TAFDEHDRRSLOMQYHW\n" + "ZEWHUQUUMLBAIVSXJ\n" + "CPVYSKEDOOPJZUQPK\n" + "RWKNWQRZAEXMGMYNY\n" + "UOXQHITETYLRBVLBL\n" + "AJXTBSZZCYTBKXEIG\n" + "CJKFUDLOVAQMSNHYX\n" + "PDKBCPOBSFPQKQPPO\n" + "SRUZVKGSTEXUJUNTK\n" + "YZIOIZWTYKLVVBQNZ\n" + "MXUXSWHEWODYXXNHR\n" + "PRLPVFKGHNTNADBLX\n" + "ZQQNLKNJQJXQOZBKN\n" + "UIJAGGJPJCJWYKSKP\n" + "TPHDBXGEYTLDKICNK\n" + "LUFEZHOBWELPOQHSJ\n" + "CDJBNDZGNVGFBCCMT\n" + "WBMLMSUKNZETIRIBJ\n" + "PJLCZNMCCCFMCPYAS\n" + "YWYKSHVQRDCHTYIXB\n" + "NXDGJCLMICGSHRSLR\n" + "BZMIOYTZDXJQFBCDL\n" + "TFBWYPZPBQUVIPVPY\n" + "MENKAAMUWUTAUJAVN\n" + "ESEBVHLEZMLAZJXBQ\n" + "YGWVDMMPXXUYDMXUZ\n" + "XLEBIZQMMHJEPTRLW\n" + "JWJKFOATBUMERTNUR\n" + "IEMWASQEAUVHXSYLO\n" + "YEJKREPDABYZPGZAR\n" + "SMEJMYGTXHDWTRSTK\n" + "BUJGYIGPNFUZAWPJV\n" + "GLJZLAEMBZADLVOAZ\n" + "UDZLAZRUBZIANHNIW\n" + "GTJKPSXOIYATPACJA\n" + "BMDRMCRPOHASYZHSQ\n" + "MZXXUHTTKENOEMCQJ\n" + "VGQLJWLXZAQOWPDSE\n" + "MGULNKBQRIGDWVKZH\n" + "SLFBBOSNAJVBBRWLL\n" + "KQHFKFQYCHDHHDGYG\n" + "IRHWTIXJKCCNYUFNB\n" + "VDVCWZCVSXAEKQZGK\n" + "VUMKDQTIRWMLHEYIG\n" + "QMFXECJGIAYRUVUGK\n" + "ZLYVHWFCIQAPBGZFB\n" + "RTHPHXLYFEFLOVFVS\n" + "VBPSAADMVGTKNGIWI\n" + "IBEJPBAOPCOEJSAAE\n" + "KPRONONKFUPCGRYSI\n" + "TUJVHIDWCHXHNIOAC\n" + "THUQVGJTGEWJDSZYS\n" + "PEOVRKYJZUWEFZZFI\n" + "KGKKFJBRTQEYVYSBS\n" + "QIOITDCVULXALAJPD\n" + "DIRGGBSQCVDDPRQUZ\n" + "CXBGJEOXHOEEWVFVU\n" + "OZWAPYUBKTBAIMDSF\n" + "MVHVBRLQZPQXCTOEN\n" + "EVCKGZLQEMMPIAOCN\n" + "ILICNRUQDGRPEOUFF\n" + "XXMRPRMDHZOIAAEME\n" + "VTFDDBCXZPDUESHVG\n" + "NNUIFEIJFNZLTHOOC\n" + "AZQBWAVIMJWLNSUPM"; 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