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 = /(?:(^[^\[]+\[\s+)\{\s+\"id\"\:|(,\s+)\{\s+\"id\"\:)/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('(?:(^[^\\[]+\\[\\s+)\\{\\s+\\"id\\"\\:|(,\\s+)\\{\\s+\\"id\\"\\:)', 'gm') const str = `{ "status": { "timestamp": "2018-10-10T23:40:26.101Z", "error_code": 0, "error_message": null, "elapsed": 14, "credit_count": 1 }, "data": [ { "id": 1, "name": "Bitcoin", "symbol": "BTC", "slug": "bitcoin", "circulating_supply": 17315325, "total_supply": 17315325, "max_supply": 21000000, "date_added": "2013-04-28T00:00:00.000Z", "num_market_pairs": 6324, "cmc_rank": 1, "last_updated": "2018-10-10T23:39:30.000Z", "quote": { "USD": { "price": 6593.07839577, "volume_24h": 3781676977.17942, "percent_change_1h": 0.299567, "percent_change_24h": -0.633751, "percent_change_7d": 0.95377, "market_cap": 114161295173.23618, "last_updated": "2018-10-10T23:39:30.000Z" } } }, { "id": 1027, "name": "Ethereum", "symbol": "ETH", "slug": "ethereum", "circulating_supply": 102492584.749, "total_supply": 102492584.749, "max_supply": null, "date_added": "2015-08-07T00:00:00.000Z", "num_market_pairs": 4471, "cmc_rank": 2, "last_updated": "2018-10-10T23:39:42.000Z", "quote": { "USD": { "price": 225.917892111, "volume_24h": 1382931374.09404, "percent_change_1h": 0.569086, "percent_change_24h": -0.704234, "percent_change_7d": 1.85499, "market_cap": 23154908703.502106, "last_updated": "2018-10-10T23:39:42.000Z" } } }, { "id": 52, "name": "XRP", "symbol": "XRP", "slug": "ripple", "circulating_supply": 39997634397, "total_supply": 99991817275, "max_supply": 100000000000, "date_added": "2013-08-04T00:00:00.000Z", "num_market_pairs": 230, "cmc_rank": 3, "last_updated": "2018-10-10T23:40:09.000Z", "quote": { "USD": { "price": 0.461478997819, "volume_24h": 411665959.164198, "percent_change_1h": 0.445149, "percent_change_24h": -3.5819, "percent_change_7d": -13.0624, "market_cap": 18458068236.65832, "last_updated": "2018-10-10T23:40:09.000Z" } } }, { "id": 1831, "name": "Bitcoin Cash", "symbol": "BCH", "slug": "bitcoin-cash", "circulating_supply": 17395525, "total_supply": 17395525, "max_supply": 21000000, "date_added": "2017-07-23T00:00:00.000Z", "num_market_pairs": 342, "cmc_rank": 4, "last_updated": "2018-10-10T23:39:36.000Z", "quote": { "USD": { "price": 512.630430925, "volume_24h": 369198906.22134, "percent_change_1h": 0.365485, "percent_change_24h": -0.745641, "percent_change_7d": -1.26889, "market_cap": 8917475476.91661, "last_updated": "2018-10-10T23:39:36.000Z" } } }, { "id": 1765, "name": "EOS", "symbol": "EOS", "slug": "eos", "circulating_supply": 906245117.6, "total_supply": 1006245119.9339, "max_supply": null, "date_added": "2017-07-01T00:00:00.000Z", "num_market_pairs": 174, "cmc_rank": 5, "last_updated": "2018-10-10T23:39:36.000Z", "quote": { "USD": { "price": 5.88204493255, "volume_24h": 532584590.023657, "percent_change_1h": 0.326144, "percent_change_24h": -0.205986, "percent_change_7d": 4.79873, "market_cap": 5330574501.627259, "last_updated": "2018-10-10T23:39:36.000Z" } } }, { "id": 512, "name": "Stellar", "symbol": "XLM", "slug": "stellar", "circulating_supply": 18890616791.6665, "total_supply": 104363617748.491, "max_supply": null, "date_added": "2014-08-05T00:00:00.000Z", "num_market_pairs": 120, "cmc_rank": 6, "last_updated": "2018-10-10T23:39:19.000Z", "quote": { "USD": { "price": 0.241243489647, "volume_24h": 40002371.0719364, "percent_change_1h": 0.417773, "percent_change_24h": -1.36287, "percent_change_7d": -0.740479, "market_cap": 4557238316.405842, "last_updated": "2018-10-10T23:39:19.000Z" } } },`; // 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