Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

/
/
g

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"""SgxEpoch"":\s*(\""([^0].{31}|.[^0].{30}|.{2}[^0].{29}|.{3}[^0].{28}|.{4}[^0].{27}|.{5}[^0].{26}|.{6}[^0].{25}|.{7}[^0].{24}|.{8}[^0].{23}|.{9}[^0].{22}|.{10}[^0].{21}|.{11}[^0].{20}|.{12}[^0].{19}|.{13}[^0].{18}|.{14}[^0].{17}|.{15}[^0].{16}|.{16}[^0].{15}|.{17}[^0].{14}|.{18}[^0].{13}|.{19}[^0].{12}|.{20}[^0].{11}|.{21}[^0].{10}|.{22}[^0].{9}|.{23}[^0].{8}|.{24}[^0].{7}|.{25}[^0].{6}|.{26}[^0].{5}|.{27}[^0].{4}|.{28}[^0].{3}|.{29}[^0].{2}|.{30}[^0].|.{31}[^0])\""|"")"; string input = @"""SgxEpoch"": ""00000000000000000000000000000000"" ""SgxEpoch"": ""00000000000000000000000000001000"" ""SgxEpoch"": ""00000000000000000000000000000000"" ""SgxEpoch"": "" ""J8G9SQFG374OI2K4NKRPADZBERUFSZBU"" []$ for i in {1..30}; do echo ""\""SgxEpoch\"": \""$(cat /dev/urandom | tr -dc 'A-Z0-9' | fold -w 32 | head -n 1)\""; done; ""SgxEpoch"": ""RG1RLP2EVNB8HDNWH9GV4TJDB531WLXB"" ""SgxEpoch"": ""GVHUIQCS92Y4D22AV7MVWD3T4PNSG1CA"" ""SgxEpoch"": ""6XNYUHV542BZ641G7NR5J3TGIZ14805T"" ""SgxEpoch"": ""WJAFO7E45QR0QVHAS9OII5LSZ2BJRRDT"" ""SgxEpoch"": ""QSXAOKMVGZ3UT7R6K9II8W42SIKJB4CH"" ""SgxEpoch"": ""C7HC5SMK85CSZ45OXW29D6JAHT4ZA2H7"" ""SgxEpoch"": ""XRV62S6YQ5BM25NKK8VGIL31GRO4KAQC"" ""SgxEpoch"": ""2ZPD3Y2U4RS5YQFKK36F6BJDTOCFK1PL"" ""SgxEpoch"": ""I7UONV2YA6H2S245KPPQAASG801BB23A"" ""SgxEpoch"": ""X7OXH645EYWTISMTT5P9X46PUOMA2EFW"" ""SgxEpoch"": ""LF2ASFTRLY1Y1NQIO89G6GS3VHM7Y2YX"" ""SgxEpoch"": ""KH0KU5213C3ET7QR99K1D1TX8N6K8JG9"" ""SgxEpoch"": ""FOXZ8F490134F1Q9ARW5JAH50KXVC1ST"" ""SgxEpoch"": ""BSFDYP5T9SUNAK097LEJH2JFAH1BVO10"" ""SgxEpoch"": ""13IR5STLX3XIRA7D0XDSGWSTUPKBIUF4"" ""SgxEpoch"": ""BTQULR3SH5C5I6I6JNVDG5OPCWZYIO21"" ""SgxEpoch"": ""DBG0DK9R9S817XWJQU76ZS1C4NB9MH0D"" ""SgxEpoch"": ""6KOJH14I94WGP7WIWSXSPIG0EMEZGN7B"" ""SgxEpoch"": ""9A9XJEOQ157KMPQPXNZKUOZJBN9N1X82"" ""SgxEpoch"": ""SQXDD61TZX0PZZI40A83B0F0WYAKJ4ED"" ""SgxEpoch"": ""7XQ1DLU186KZ66ZTU393T0IT301UBHVY"" ""SgxEpoch"": ""4M0M5Y5MOMG2RPC5153JXUY14B31O19P"" ""SgxEpoch"": ""JY1HPMZYSCGGBUG0FG5TH8R4EXSE57EZ"" ""SgxEpoch"": ""74O8E3WPY26ASOHM7E91KNV84AZ8ZNTM"" ""SgxEpoch"": ""EOYJPEBTDDFI3T2YDFT16PZLJLOAQ0NK"" ""SgxEpoch"": ""0BVQ6GQF3Q12SCW4GGDMCQQXBCDRBL9Z"" ""SgxEpoch"": ""1L91SIZYM7ANWJE1TZX7U64QEMW267U1"" ""SgxEpoch"": ""E0CUT3MIJLZECDP9VE63IO4TDVPNOBJ2"" ""SgxEpoch"": ""KJYF7SZUSBGZDAIT5366YVQ63ECEMGQ1"" ""SgxEpoch"": ""P4SV9WTRL0HGOEAD48K3E1ZHP1ZTRDKN"" []$ "; foreach (Match m in Regex.Matches(input, pattern)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx