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

/
/
img

Test String

Code Generator

Language

Generated Code

const regex = /Activate-Status(?!.*Ready)|Overall.*Status(?!.*Operable)|Operability(?!.*Operable)|Controller.*Status(?!.*Optimal)|Errors(?!.*0)|Dropped(?!.*0)|Discarded(?!.*0)|Bad(?!.*220)|Suspect(?!.*No)|Thresholded(?!.*0)|Visibility.(?!.*yes)|Thermal.*Status(?!.*OK)|HA.*(?!.*READY)/img; // Alternative syntax using RegExp constructor // const regex = new RegExp('Activate-Status(?!.*Ready)|Overall.*Status(?!.*Operable)|Operability(?!.*Operable)|Controller.*Status(?!.*Optimal)|Errors(?!.*0)|Dropped(?!.*0)|Discarded(?!.*0)|Bad(?!.*220)|Suspect(?!.*No)|Thresholded(?!.*0)|Visibility.(?!.*yes)|Thermal.*Status(?!.*OK)|HA.*(?!.*READY)', 'img') const str = `ID 20: Location: G1 Presence: Equipped Overall Status: Operable Operability: Degraded Visibility: foobar Product Name: 16GB DDR3-1600-MHz RDIMM/PC3-12800/dual rank/1.35V PID: VID: V01 Vendor: 0x2C00 Vendor Description: Micron Technology, Inc. Vendor Part Number: Vendor Serial (SN): HW Revision: 0 Form Factor: DIMM Type: DDR3 Thermal Status: FUBAR Capacity (MB): 16384 Clock: 1600 Latency: 0.600000 Width: 64 `; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; while ((m = regex.exec(str)) !== null) { // This is necessary to avoid infinite loops with zero-width matches if (m.index === regex.lastIndex) { regex.lastIndex++; } // The result can be accessed through the `m`-variable. m.forEach((match, groupIndex) => { console.log(`Found match, group ${groupIndex}: ${match}`); }); }

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