const regex = /^\.0*[1-9]\d*$|^0(\.0*[1-9]\d*)$|^[1-9]\d*?(\.\d+)?$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^\\.0*[1-9]\\d*$|^0(\\.0*[1-9]\\d*)$|^[1-9]\\d*?(\\.\\d+)?$', 'gm')
const str = `0
-0
0.0
0000
.0
.0000
000.
0.0
0.000000
0000.0
0000.1
========================
.1
.0001
.010
0.0001
0.1111
0.1100
0.1
1.0
101
101.0
101.000
101.0001
101.0001000
1111.00000
1000
========================
0111
010.1
0110
000001
000100
`;
// 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