const regex = /^(?i:p).*\.txt$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(?i:p).*\\.txt$', 'gm')
const str = `
P671_221.md
P671_221.txt
Z671_221.txt
P6 712 21.py
P6 712 21.txt
06 712 21.txt
P6AASF239FOaf71221.java
P6AASF239FOaf71221.txt
_6AASF239FOaf71221.txt
P671221.pde
P671221.txt
12671221.txt
`;
// 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