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

/
/
gm

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?m)("text":\s*\{\s*"ja_JP":\s*")([^"]*)"`) var str = `"textList": [ { "id": 4, "name": "modeselect", "folder": true, "children": [ { "id": 13, "name": "Motion", "fontId": 6, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Motion" }, "folder": false }, { "id": 12, "name": "Story", "fontId": 7, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Story" }, "folder": false }, { "id": 11, "name": "Main_Character", "fontId": 6, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Main Character" }, "folder": false }, { "id": 5, "name": "Mode_select", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Mode Select" }, "folder": false }, { "id": 24, "name": "Story_Mode", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Story Mode" }, "folder": false }, { "id": 25, "name": "Battle_Mode", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Battle Mode" }, "folder": false }, { "id": 8297, "name": "Dictionary", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Dictionary" }, "folder": false }, { "id": 46, "name": "Z_desition", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Z key:OK\nC key:Back" }, "folder": false }, { "id": 47, "name": "back_to_the_title", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Back to the title?" }, "folder": false }, { "id": 51, "name": "select_mode", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Select Mode" }, "folder": false }, { "id": 8298, "name": "Go_to_the_Story_Mode", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Go to the Story Mode?" }, "folder": false }, { "id": 8299, "name": "Go_to_the_Battle_Mode", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Go to the Battle Mode?" }, "folder": false }, { "id": 8300, "name": "Go_to_the_Dictionary", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Go to the Dictionary?" }, "folder": false }, { "id": 48, "name": "ok", "fontId": 8, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "OK" }, "folder": false }, { "id": 49, "name": "cancel", "fontId": 8, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Cancel" }, "folder": false }, { "id": 7, "name": "Story_outline", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "自由奔放で傲慢な魔族\nであるアストリア。\nアストリアは最近\n地上に住まう種族の\n殲滅に勤しんでいた。\n次第に恐怖と畏れから\n地上に住まう者達に名が\n知れ渡り始めていた。\nある日、アストリアの\n元に面倒事が\n持ち込まれる・・・" }, "folder": false }, { "id": 6, "name": "character_name", "folder": true, "children": [ { "id": 8, "name": "Astoria", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Astoria" }, "folder": false }, { "id": 19, "name": "Test2_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Test2" }, "folder": false }, { "id": 20, "name": "Test3_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Test3" }, "folder": false }, { "id": 21, "name": "Test4_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Test4" }, "folder": false }, { "id": 22, "name": "Test5_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Test5" }, "folder": false }, { "id": 23, "name": "Test6_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Test6" }, "folder": false } ] }, { "id": 9, "name": "story_name", "folder": true, "children": [ { "id": 10, "name": "Story1_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "1. 魔族娘の自由旅" }, "folder": false }, { "id": 14, "name": "Story2_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "2. " }, "folder": false }, { "id": 15, "name": "Story3_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "3. " }, "folder": false }, { "id": 16, "name": "Story4_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "4. " }, "folder": false }, { "id": 17, "name": "Story5_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "5. " }, "folder": false }, { "id": 18, "name": "Story6_name", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "6. " }, "folder": false } ] } ] }, { "id": 26, "name": "stageselect", "folder": true, "children": [ { "id": 31, "name": "Stage_select", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Stage Select" }, "folder": false }, { "id": 32, "name": "GameStart", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Game Start" }, "folder": false }, { "id": 33, "name": "Enemy_Character", "fontId": 6, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Enemy Character" }, "folder": false }, { "id": 50, "name": "back_to_the_modeselect", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "Back to the Mode Select?" }, "folder": false }, { "id": 27, "name": "character_name_stage", "folder": true, "children": [ { "id": 34, "name": "Leonor", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Leonor" }, "folder": false }, { "id": 35, "name": "Riz", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Riz" }, "folder": false }, { "id": 36, "name": "Mary", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Mary" }, "folder": false }, { "id": 37, "name": "Koyo", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Koyo" }, "folder": false }, { "id": 38, "name": "Beryl", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Beryl" }, "folder": false }, { "id": 39, "name": "Amelia", "fontId": 5, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": " Amelia" }, "folder": false } ] }, { "id": 28, "name": "stage_outline", "folder": true, "children": [ { "id": 979, "name": "stage1_outline", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "アストリアは日課である\n種族の殲滅を終わらせて\n城で休息を取っていた。\nそんな時、何者かが城に\n侵入した事を察知する。\n急ぎ様子を見に行くと\nそこには興味深そうに\n城を見渡す堕天使の\nレオノールが居た・・・" }, "folder": false }, { "id": 980, "name": "stage2_outline", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "レオノールから\n聞き出した情報を頼りに\n妖狐を探していた。\nその最中、魔族のリズが\n道の真ん中で風景画を\n描いているのを見かける\n興味本位で声を掛け\n描いている絵を見せて\nもらったのだが・・・" }, "folder": false }, { "id": 981, "name": "stage3_outline", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "ジメジメと湿った空気が\n充満している薄暗い\n森の中を進んでいると\n奇妙な帽子を被った\n魔女のメアリーが\nアストリアの前に\n立ち塞がる。\n妖狐の差し金で\nアストリアの邪魔を\nしようとするが・・・" }, "folder": false }, { "id": 982, "name": "stage4_outline", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "森を抜けた先に\n古びた神社を見つけた\nアストリア。\n中から九つの白い尾を\n持った妖狐の狐耀が\n現れる。\nアストリアと狐耀は\n自身の主張を通すべく\n力尽くで相手を屈服\nさせようとする・・・" }, "folder": false }, { "id": 983, "name": "stage5_outline", "fontId": 9, "letterSpacing": 0, "lineSpacing": 0, "text": { "ja_JP": "面倒事を終わらせて\n気が晴れたアストリアに\n竜人種のベリルが声を\n掛けてくる。\nアストリアが狐耀を\n倒したことに対して\nベリルは感謝を示す。\nどうでも良い\nアストリアは休むべく\n帰ろうとするが・・・" }, "folder": false` 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/