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

/
/
g

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`#EXTVDJ:.*?[0-9]+.*?t>(.*?)<.*?e>(.*?)<.*?\n.*?mp3`) var str = `#EXTVDJ:<filesize>16027776</filesize><artist>Kyau & Albert, Steve Brian</artist><title>Reverie (DJ Version)</title><songlength>397.340</songlength> E:\Music\For Sorting\From USB Stick\Music\2017-19\10932465_Reverie_DJ_Version.mp3 #EXTVDJ:<filesize>14624215</filesize><artist>Paul van Dyk, KINETICA</artist><title>First Contact (Original Mix)</title><songlength>361.739</songlength> E:\Music\For Sorting\July 2020\13319740_First_Contact_Original_Mix.mp3 #EXTVDJ:<filesize>16609012</filesize><artist>Solarstone, Meredith Call</artist><title>I Found You (Giuseppe Ottaviani Remix)</title><songlength>410.929</songlength> E:\Music\For Sorting\From USB Stick\Music\2017-19\9710365_I_Found_You_Giuseppe_Ottaviani_Remix.mp3 #EXTVDJ:<filesize>13277361</filesize><artist>Darude, Ashley Wallbridge, Foux</artist><title>Surrender feat. Foux (Extended Mix)</title><songlength>328.918</songlength> E:\Music\For Sorting\From USB Stick\Music\2017-19\10161893_Surrender_feat__Foux_Extended_Mix.mp3 #EXTVDJ:<filesize>21313586</filesize><artist>Ciaran McAuley, Clare Stagg</artist><title>All I Want (Mark Sherry Extended Remix)</title><songlength>526.866</songlength> E:\Music\For Sorting\July 2020\13446725_All_I_Want_Mark_Sherry_Extended_Remix.mp3 #EXTVDJ:<filesize>15246761</filesize><artist>Cosmic Gate, Denise Rivera</artist><title>Body Of Conflict (Elevven Extended Remix)</title><songlength>377.681</songlength> E:\Music\For Sorting\July 2020\12462485_Body_Of_Conflict_Elevven_Extended_Remix.mp3 #EXTVDJ:<filesize>17663564</filesize><artist>Philippe El Sisi, Omar Sherif</artist><title>Demolition (Original Mix)</title><songlength>438.857</songlength> E:\Music\For Sorting\July 2020\13498731_Demolition_Original_Mix.mp3 #EXTVDJ:<filesize>13108166</filesize><artist>Alex Kunnari</artist><title>Sundown (Extended Mix)</title><songlength>323.138</songlength> E:\Music\For Sorting\From USB Stick\Music\2017-19\10689952_Sundown_Extended_Mix.mp3 #EXTVDJ:<filesize>16468045</filesize><artist>Chris Schweizer</artist><title>Don't Be Scared (Extended Mix)</title><songlength>408.696</songlength> E:\Music\For Sorting\July 2020\13609598_Don_t_Be_Scared_Extended_Mix.mp3 #EXTVDJ:<filesize>15035754</filesize><artist>Dan Stone, Victoriya</artist><title>I Can't Tell (Ferry Tayle Extended Remix)</title><songlength>372.702</songlength> E:\Music\For Sorting\July 2020\13689560_I_Can_t_Tell_Ferry_Tayle_Extended_Remix.mp3 #EXTVDJ:<filesize>16562928</filesize><artist>Seri, Nifra</artist><title>Edge of Time feat. Seri (Extended Mix)</title><songlength>410.285</songlength> E:\Music\For Sorting\From USB Stick\Music\2017-19\9090018_Edge_of_Time_feat__Seri_Extended_Mix.mp3 #EXTVDJ:<filesize>15886841</filesize><artist>Claus Backslash</artist><title>Absolute Delusion (Extended Mix)</title><songlength>395.294</songlength> E:\Music\For Sorting\July 2020\13741469_Absolute_Delusion_Extended_Mix.mp3 #EXTVDJ:<filesize>18052845</filesize><artist>Sivan, Graham Bell</artist><title>The Sound Of Letting Go (Tribute To Yotam) (Extended Mix)</title><songlength>448.333</songlength> E:\Music\For Sorting\July 2020\13674262_The_Sound_Of_Letting_Go__Tribute_To_Yotam__Extended_Mix.mp3 ` var substitution = "$1 - $2" fmt.Println(re.ReplaceAllString(str, substitution)) }

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 Golang, please visit: https://golang.org/pkg/regexp/