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

/
/
gm

Test String

Code Generator

Language

Generated Code

const regex = /[\w\W]+?Code[\w\W]+?(?<po_number>\d{8})\s\|[\w\W]+?\s\|[\w\W]+?\s\|[\w\W]+?\s\|[\w\W]+?\s\|[\w\W]+?\s\|[\w\W]+?\s\|[\w\W]+?\s\|[\w\W]+?\s|\s\|[\w\W]+?\s\|[\w\W]+?\s\|\s(?<reason>[\w\W]+?)\|/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('[\\w\\W]+?Code[\\w\\W]+?(?<po_number>\\d{8})\\s\\|[\\w\\W]+?\\s\\|[\\w\\W]+?\\s\\|[\\w\\W]+?\\s\\|[\\w\\W]+?\\s\\|[\\w\\W]+?\\s\\|[\\w\\W]+?\\s\\|[\\w\\W]+?\\s\\|[\\w\\W]+?\\s|\\s\\|[\\w\\W]+?\\s\\|[\\w\\W]+?\\s\\|\\s(?<reason>[\\w\\W]+?)\\|', 'gm') const str = `The Acme Corp has requested you cancel the following order(s) as soon as possible. If you're unable to cancel the order(s), or have questions about the reason for canceling, please contact Acme Corp directly. For the best support, please do not reply to this email. PO# | Order Received On | Ship-to Zip Code 12345678 | 2024-03-21 18:26:54 | Line # | Merchant SKU | Vendor SKU | Cancel Qty | Cancel Reason | Packing Slip Bundle 1 | 1XX718YY40 | 654321 | 1 | Cancelled at Merchant's Request | 19205839 Depending on the business rules, you may need to include some of these details on the fulfillment confirmation you use to cancel the order.`; // 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