const regex = /^(?:\d{1,13}(?:\.\d{1,2})?|\.[1-9][0-9]?)$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(?:\\d{1,13}(?:\\.\\d{1,2})?|\\.[1-9][0-9]?)$', 'gm')
const str = `0
0.5
1.55
.5
1234567890123
1234567890123.5
1234567890123.00
.01
.
.,
.0
1.234
5.
12345678901234
12345678901234.56
`;
// 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