Regular Expressions 101

Save & Share

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
  • Match everything enclosed
    (?:...)
  • Capture everything enclosed
    (...)
  • 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

Substitution

Processing...

Code Generator

Language

Generated Code

const regex = /(?i)\[\[(?<firstlevelfolder>(?:assets|Bücher|Dokument|epsilon_notes|kontakte|literatur|Projekt|Test|Wissen|WV)(?:[\w_]*)\/)(?<bildpfad>[^\|\\\]]+)(\\\||\|)*(?<bildattribut>[^\]]*)\]\]/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('(?i)\\[\\[(?<firstlevelfolder>(?:assets|Bücher|Dokument|epsilon_notes|kontakte|literatur|Projekt|Test|Wissen|WV)(?:[\\w_]*)\\\/)(?<bildpfad>[^\\|\\\\\\]]+)(\\\\\\||\\|)*(?<bildattribut>[^\\]]*)\\]\\]', 'gm') const str = `Link zum Bild: ![[Projekte/Mikroskop/_resources/f04ae6b6a924e20e761dce25603b3bd8.jpg]] ![[assets/(15) Bigger Arms Workout (Dumbbells Only) - YouTube - 3 34.jpeg]] ![[subfolder/image.png|100x100]] ![[subfolder/sub2/image.png|100x100]] ![[../../ima/ge.png|100x100]] [[Dokumente/Gesundheit/Dave/_Dave_overview]] ![[Projekte/image.png|100x100]] ![[Projekte_irgendwas/image.Png|100x100]] [[assets/MiSZ 2T.pdf]] [[assets2/MiSZ 2T.pdf]] ![[Projekte/Mikroskop/Leica, Wild/Product Guide for Stereomicroscopes. Living up to Life.pdf]] ![[BA_GSZ 2_GSZ 2T.pdf#page=7]] ![[BA_GSZ 2_GSZ 2T.pdf]] Beispiel-tabelle: Caption1 | Caption2 | ---|---| Content1 text | Link innerhalb Tabelle mit Attributen ![[Projekte/Mikroskop/_resources/f04ae6b6a924e20e761dce25603b3bd8.jpg\\|300]] | vorerst letzte Zeile | Text Text Text | ![[Projekte/Mikroskop/_resources/f04ae6b6a924e20e761dce25603b3bd8.jpg\\|200]]`; const subst = `[<span style="color:blue">CPLinkToFile: </span> <span style="background-color: #caecff; color:blue">**${firstlevelfolder}${bildpfad}**</span>](/storage/emulated/0/onedrive/obsidian/${firstlevelfolder}${bildpfad})`; // The substituted value will be contained in the result variable const result = str.replace(regex, subst); console.log('Substitution result: ', result);

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 JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions