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

/
/
gmi

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?mi)imageBigViewURL=\[(.+?)\];`) var str = `<script type="text/javascript"> if(!window.runParams) { window.runParams = {}; } window.runParams.imageServer="http://i00.i.aliimg.com"; window.runParams.imageDetailPageURL="//www.aliexpress.com/item-img/2015-Winter-Beanies-Solid-Color-Hat-Unisex-Plain-Warm-Soft-Beanie-Skull-Knit-Cap-Hats-Knitted/32462312884.html"; window.runParams.imageBigViewURL=[ "http://g02.a.alicdn.com/kf/HTB1JJG8JpXXXXb7XFXXq6xXFXXXs/2015-зимние-шапочки-сплошной-цвет-шляпа-мужская-обычная-теплый-мягкий-шапочка-череп-вязаные-Touca-Gorro-шапки.jpg", "http://g02.a.alicdn.com/kf/HTB1frm7JpXXXXbFXFXXq6xXFXXXo/2015-зимние-шапочки-сплошной-цвет-шляпа-мужская-обычная-теплый-мягкий-шапочка-череп-вязаные-Touca-Gorro-шапки.jpg", "http://g02.a.alicdn.com/kf/HTB1BsaSJpXXXXa3aXXXq6xXFXXX9/2015-зимние-шапочки-сплошной-цвет-шляпа-мужская-обычная-теплый-мягкий-шапочка-череп-вязаные-Touca-Gorro-шапки.jpg", "http://g02.a.alicdn.com/kf/HTB1tUYfJpXXXXbVXXXXq6xXFXXXc/2015-зимние-шапочки-сплошной-цвет-шляпа-мужская-обычная-теплый-мягкий-шапочка-череп-вязаные-Touca-Gorro-шапки.jpg", "http://g04.a.alicdn.com/kf/HTB1LRSUJpXXXXaeaXXXq6xXFXXXr/2015-зимние-шапочки-сплошной-цвет-шляпа-мужская-обычная-теплый-мягкий-шапочка-череп-вязаные-Touca-Gorro-шапки.jpg", "http://g02.a.alicdn.com/kf/HTB1VSi8JpXXXXbUXFXXq6xXFXXXU/2015-зимние-шапочки-сплошной-цвет-шляпа-мужская-обычная-теплый-мягкий-шапочка-череп-вязаные-Touca-Gorro-шапки.jpg" ]; window.runParams.mainBigPic = "http://g02.a.alicdn.com/kf/HTB1JJG8JpXXXXb7XFXXq6xXFXXXs/2015-зимние-шапочки-сплошной-цвет-шляпа-мужская-обычная-теплый-мягкий-шапочка-череп-вязаные-Touca-Gorro-шапки.jpg"; </script>` 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/