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

/
/

Test String

Code Generator

Generated Code

const regex = /Gas Commercial Service \([\S\s]+?(?:[\s]+(?:(?:(?:[\w]+ )*)?(?:[\w]+)?Tax:[xX\d\.\%\s]*?\$[\d\.\s]*?\$([\d\.]*)\s*?))(?:[\s]+(?:(?:(?:[\w]+ )*)?(?:[\w]+)?Tax:[xX\d\.\%\s]*?\$[\d\.\s]*?\$([\d\.]*)\s*?))?(?:[\s]+(?:(?:(?:[\w]+ )*)?(?:[\w]+)?Tax:[xX\d\.\%\s]*?\$[\d\.\s]*?\$([\d\.]*)\s*?))?(?:[\s]+(?:(?:(?:[\w]+ )*)?(?:[\w]+)?Tax:[xX\d\.\%\s]*?\$[\d\.\s]*?\$([\d\.]*)\s*?))?(?:[\s]+(?:(?:(?:[\w]+ )*)?(?:[\w]+)?Tax:[xX\d\.\%\s]*?\$[\d\.\s]*?\$([\d\.]*)\s*?))?(?:[\s]+(?:(?:(?:[\w]+ )*)?(?:[\w]+)?Tax:[xX\d\.\%\s]*?\$[\d\.\s]*?\$([\d\.]*)\s*?))?/; // Alternative syntax using RegExp constructor // const regex = new RegExp('Gas Commercial Service \\([\\S\\s]+?(?:[\\s]+(?:(?:(?:[\\w]+ )*)?(?:[\\w]+)?Tax:[xX\\d\\.\\%\\s]*?\\$[\\d\\.\\s]*?\\$([\\d\\.]*)\\s*?))(?:[\\s]+(?:(?:(?:[\\w]+ )*)?(?:[\\w]+)?Tax:[xX\\d\\.\\%\\s]*?\\$[\\d\\.\\s]*?\\$([\\d\\.]*)\\s*?))?(?:[\\s]+(?:(?:(?:[\\w]+ )*)?(?:[\\w]+)?Tax:[xX\\d\\.\\%\\s]*?\\$[\\d\\.\\s]*?\\$([\\d\\.]*)\\s*?))?(?:[\\s]+(?:(?:(?:[\\w]+ )*)?(?:[\\w]+)?Tax:[xX\\d\\.\\%\\s]*?\\$[\\d\\.\\s]*?\\$([\\d\\.]*)\\s*?))?(?:[\\s]+(?:(?:(?:[\\w]+ )*)?(?:[\\w]+)?Tax:[xX\\d\\.\\%\\s]*?\\$[\\d\\.\\s]*?\\$([\\d\\.]*)\\s*?))?(?:[\\s]+(?:(?:(?:[\\w]+ )*)?(?:[\\w]+)?Tax:[xX\\d\\.\\%\\s]*?\\$[\\d\\.\\s]*?\\$([\\d\\.]*)\\s*?))?', '') const str = ` Due Date: 03/13/13 Electric Commercial Service (E2C) Meter Number: 298209 Reading 02/26/13 91391 Access Chg: 30 days x \$0.6324 \$18.97 Reading 01/27/13 90150 Access Chg: 1,241 kWh x \$0.0532 \$66.02 1241 Kilowatt Hours(KWH) Supply Chg: 1,241 kWh x \$0.0269 \$33.38 Your average daily usage was 41.37 KWH ECA: 1,241 kWh x \$-0.001 \$1.24 CR Capacity Chg: 1,241 kWh x \$0.0012 \$1.49 City Sales Tax: 2.5% x \$118.62 \$2.97 County Sales Tax: 1.23% x \$118.62 \$1.46 State Sales Tax: 2.9% x \$118.62 \$3.44 PPRTA Tax: 1% x \$118.62 \$1.19 ECA = Electric Cost Adjustment - Making energy-efficiency improvements to your business? Save more money with rebates. Visit csu.org/business for details. Total charge this service \$127.68 Gas Commercial Service (G1C) Meter Number: 73757 Reading 02/26/13 25459 Access Chg (G1CL): 30 days x \$0.7623 \$22.87 Reading 01/27/13 25277 Access Chg (G1CL): 182 CCF x \$0.1571 \$28.59 182 Hundred Cubic Feet(CCF) Gas Cost (G1CL): 182 CCF x \$0.6034 \$109.82 Your average daily usage was 6.07 CCF GCA (G1CL): 182 CCF x \$-0.17 \$30.94 CR City Sales Tax: 2.5% X \$130.34 \$3.26 County Sales Tax: 1.23% X \$130.34 \$1.60 State Sales Tax: 2.9% X \$130.34 \$3.78 BullSheet Federal SuperTax: 2.9% X \$130.34 \$3.78 PPRTA Tax: 1% X \$130.34 \$1.30 - Smell a rotten egg odor at your business? You may have a natural gas leak. Leave the premise immediately, then call 9-1-1. Emergency crews will respond. Total charge this service \$140.28`; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; if ((m = regex.exec(str)) !== null) { // 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