{your package manager} install pkg-config libpcre++-dev
go get github.com/0xTeles/jsleak/v2/jsleak

-json string
        [+] Json output file
-pattern string
        [+] File contains patterns to test
-timeout int
        [+] Timeout for request in seconds (default 5)
-verbose
        [+] Verbose Mode

cat urls.txt | jsleak -pattern regex.txt
[+] Url: http://localhost/index.js
[+] Pattern: p([a-z]+)ch
[+] Match: peach