Regex to match CSS rules and media queries

CSS_regex.txt

// Source: https://stackoverflow.com/questions/36910664/recursive-subroutine-regex-to-match-css-media-queries#answer-36911319
@media print\b[^{]*({((?:[^{}]+|(?1))*)})

// to match i.e.:
@media print {
    .post {
        margin: 6.6rem 0px 8.8rem;
        padding-bottom: 2.2rem;
        border-bottom: #eaecee
    }
}

// To match any simple rule
.ctrl \{[^}]*\}

// to match i.e.:
.ctrl {
    background: 0px -220px repeat scroll rgba(0, 0, 0, 0.3);
    width: 100%;
    height: 40px;
    bottom: 0;
    left: 0;
    position: absolute
}