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

r"
"
gm

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?m)(?:[\u4E00-\u9FFF\u3400-\u4DBF\uF900-\ufaff\u3040-\u309f\u30a0-\u30ff\u3000-\u303f\uff21-\uff3a\uff41-\uff5a\uff10-\uff19\uff00-\uff0eA-Za-z0-9@.,;!\? 　～♥\\]*)(?P<match>(?:[^\u4E00-\u9FFF\u3400-\u380f\uF900-\ufaff\u3040-\u309f\u30a0-\u30ff\u3000-\u303f\uff21-\uff3a\uff41-\uff5a\uff10-\uff19A-Za-z0-9\r\n]|[人・;皿。゜°うぅ]){3,})(?:[\u4E00-\u9FFF\u3400-\u4DBF\uF900-\ufaff\u3040-\u309f\u30a0-\u30ff\u3000-\u303f\uff21-\uff3a\uff41-\uff5a\uff10-\uff19A-Za-z0-9@.,; 　～♥\\]*)`) var str = `ふう。お腹いっぱい( ´•౪•\`), 試験頑張るぞ＼＼\\ ٩( ‘ω’ )و //／／ 心の相談は　メール　tiknathan@mail.goo.ne.jp までご連絡ください ドーピング系浪人生(n=1) 横浜は関内にある「　ＢＷＹ　らっきょ　」に初訪問してまいりました関東スープカレーブームの火付け役となったお店の「　人気ＮＯ.１　チキンカレー　」をいただきました(´∀｀人) 鳥取県倉吉市 倉吉農業高校 3年食品科 （音楽部・茶道部） AKB48大ファン高校生！まゆゆ、中野郁海ちゃん神推し m0326w｡♥｡･ﾟ♡ﾟ･｡♥｡i0820n～現在♥大好きだよ♥ AKBファンの方はフォローお願いします^-^ \n\n来春から新社会人・・・の予定(´・ω・｀) nn(｡´-д-)疲れた。。` for i, match := range re.FindAllString(str, -1) { fmt.Println(match, "found at index", 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 Golang, please visit: https://golang.org/pkg/regexp/