Solidity pragma version regex

getSolcVersion.ts

export async function getSolcVersion(filePath: string): Promise<string> {
    const rl = readline.createInterface({
        input: fs.createReadStream(filePath),
        crlfDelay: Infinity
    });

    let versionFound = false;
    for await (const line of rl) {
        if (line.startsWith('pragma')) {
            versionFound = true;
            const regex = /^pragma solidity [\^\~\>\<]?=?(?<version>[0-9\.]*);/;
            const groups = line.match(regex).groups;
            return groups.version;
        }
    };
    if (!versionFound) throw Error('No pragma solidity version found');
}