Split number by leading and trailing zeros

Question

I am trying to write a regex for split that will result as follows:

'4.82359634' -> ['', '4.82359634', '']
'0.82300634' -> ['0.', '82300634', '']
'5.10000000' -> ['', '5.1', '0000000']
'5,10000000' -> ['', '5,1', '0000000'] // Handle commas or dots in middle section
'0.00000274' -> ['0.00000', '274', '']

Here's what I've attempted so far, it's 2 regexes and not working properly either:

 function splitZeros(v) { const [leftAndMiddle, right] = v.split(/(0+$)/).filter(Boolean); const [left, middle] = leftAndMiddle.split(/(^[0,.]+)/).filter(Boolean) console.log({ left, middle, right }) } // (NOT working properly), comments are desired results. splitZeros("4.82359634"); // ['', '4.82359634', ''] splitZeros("0.82359634"); // ['0.', '82359634', ''] splitZeros("5.10000000"); // ['', '5.1', '0000000'] splitZeros("5,10000000"); // ['', '5,1', '0000000'] splitZeros("0.00000274"); // ['0.00000', '274', '']

Answer 1

You may match and capture the parts using

/^(0*(?:[.,]0*)?)([\d.,]*?)(0*(?:[.,]0*)?)$/

See the regex demo .

Details

• ^ - start of string
• (0*(?:[.,]0*)?) - Group 1: zero or more 0 chars followed with an optional sequence of . or , and then zero or more 0 s
• ([\\d.,]*?) - Group 2: zero or more digits, commas or periods, but as few as possible due to the *? lazy quantifier
• (0*(?:[.,]0*)?) - Group 3: zero or more 0 chars followed with an optional sequence of . or , and then zero or more 0 s
• $ - end of string.

JS demo:

 function splitZeros(v) { const [_, left, middle, right] = v.match(/^(0*(?:[.,]0*)?)([\\d.,]*?)(0*(?:[.,]0*)?)$/); console.log({ left, middle, right }) } splitZeros("4.82359634"); // ['', '4.82359634', ''] splitZeros("0.82359634"); // ['0.', '82359634', ''] splitZeros("5.10000000"); // ['', '5.1', '0000000'] splitZeros("5,10000000"); // ['', '5,1', '0000000'] splitZeros("0.00000274"); // ['0.00000', '274', '']

Answer 2

You could take some groups and omit the whole matching string.

 const split = s => s.match(/^([0.,]*)(.*?)(0*)$/).slice(1); var data = [ '4.82359634', // ['', '4.82359634', ''] '0.82359634', // ['0.', '82359634', ''] '5.10000000', // ['', '5.1', '0000000'] '5,10000000', // ['', '5,1', '0000000'] // Handle commas or dots in middle section '0.00000274', // ['0.00000', '274', ''] ]; console.log(data.map(split));

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