const regex = /(\{(?:[^}{]+|\{(?:[^}{]+|\{[^}{]*\})*\})*\})/mg;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(\\{(?:[^}{]+|\\{(?:[^}{]+|\\{[^}{]*\\})*\\})*\\})', 'mg')
const str = `h2.entry-title{font:18px/24px "Roboto",Helvetica,Arial,Verdana,sans-serif;margin-bottom:4px}.h3-size.entry-title{padding-right:10px;text-align:justify}.h3-size{font:normal 20px / 24px "Roboto",Helvetica,Arial,Verdana,sans-serif!important}.top-bar{padding:0}@media screen and (min-width:1051px){body.overlap .page-title .wf-wrap{padding-top:70px!important;padding-bottom:70px!important}}
@media screen and (min-width:641px) and (max-width:1050px){body.overlap .page-title .wf-wrap{padding-top:42px!important;padding-bottom:42px!important}body.page-title .wf-td .breadcrumbs{margin-top:2px}}
@media screen and (min-width:0) and (max-width:640px){body.overlap .page-title .wf-wrap{padding-top:0!important;padding-bottom:4px!important}.h3-size{font:normal 17px / 21px "Roboto",Helvetica,Arial,Verdana,sans-serif!important}body.breadcrumbs.breadcrumbs-bg{margin-top:0!important}.page-title .breadcrumbs,.page-title .breadcrumbs a{font-size:11px!important}}
.wf-td .text-normal{font-size:12px}.breadcrumbs.bg-light{padding:3px 8px!important}.blog-content.wf-td p{margin-bottom:8px}.blog-content.wf-td .entry-meta{padding:0 0 4px}.blog.layout-list .post .alignleft{margin-bottom:5px}.blog.layout-list .post{padding-top:5px}.post .entry-title a:hover{filter:saturate(4)}.page-title .wf-container-title{padding-top:0!important;padding-bottom:0!important}.vc_tta-title-text{font:13px/16px "Roboto",Helvetica,Arial,Verdana,sans-serif;font-weight:500}#text-2 .widget-title{font:13px/18px "Roboto",Helvetica,Arial,Verdana,sans-serif}#text-2 .textwidget{line-height:14px}#footer .wf-container-footer{padding-top:15px}#page .project-share-overlay .share-button.entry-share{font:18px/20px "Roboto",Helvetica,Arial,Verdana,sans-serif;color:#4a66d6;filter:contrast(200%);filter:saturate(4)}.shortcode-action-box{padding:20px 25px 10px 30px!important;color:#4a66d6;filter:contrast(200%);filter:saturate(4)}.content .soc-ico a .icon{fill:#0537ff}#footer .wf-container-footer{opacity:.5}.widget_search form{margin:0 0 0 0!important}@media screen and (min-width:821px){.sidebar-content .widget-title{margin-bottom:5px!important}.cat-item{margin:0!important;padding:5px 0 0!important}.widget_emd4ebookandmagazinesdownloadwidget ul.mccw-col-first,.emd4ebookandmagazinesdownloadwidget .mccw-col,.sidebar-content .mccw-col{padding-right:14px!important}.mccw-col,.widget_emd4ebookandmagazinesdownloadwidget ul.mccw-col-first,.widget_emd4ebookandmagazinesdownloadwidget ul.mccw-col-last,.emd4ebookandmagazinesdownloadwidget .mccw-col,.sidebar-content .mccw-col{width:-moz-calc(50% - 14px)!important;width:-o-calc(50% - 14px)!important;width:-webkit-calc(50% - 14px)!important;width:calc(50% - 14px)!important}}
@media screen and (min-width:360px) and (max-width:820px){.sidebar-content .widget-title{margin-bottom:20px!important}.cat-item{padding:7px 0 7px 0!important}.widget_emd4ebookandmagazinesdownloadwidget ul.mccw-col-first,.emd4ebookandmagazinesdownloadwidget .mccw-col,.sidebar-content .mccw-col{padding-right:14px!important}.mccw-col,.widget_emd4ebookandmagazinesdownloadwidget ul.mccw-col-first,.widget_emd4ebookandmagazinesdownloadwidget ul.mccw-col-last,.emd4ebookandmagazinesdownloadwidget .mccw-col,.sidebar-content .mccw-col{width:-moz-calc(50% - 14px)!important;width:-o-calc(50% - 14px)!important;width:-webkit-calc(50% - 14px)!important;width:calc(50% - 14px)!important}}
@media screen and (max-width:359px){.sidebar-content .widget-title{margin-bottom:20px!important}.cat-item{padding:7px 0 7px 0!important}.widget_emd4ebookandmagazinesdownloadwidget ul.mccw-col-first{padding-right:0!important;width:100%;padding-bottom:10px}}
.style-3 .yuzo-list:before,.style-3 .yuzo-list::before{content:'';background:none!important;position:absolute;left:0;top:7px;width:22px;height:22px;opacity:.2}.style-3 .yuzo-list a{line-height:16px!important}.yuzo-list{border-bottom:0 solid #f4f4f4!important}.style-3 .yuzo-list a:hover{filter:saturate(4);color:#4a66d6;text-decoration:none}.yuzo_related_post_widget{margin:0}.yuzo_widget_wrap .yuzo_views_post{padding:0 2px}.style-3 .yuzo-list a{padding-left:0!important}.yuzo_related_post_widget .yuzo-list .link-list .yuzo_views_post{display:inline-block!important}.yuzo-list .link-list .yuzo_views_post,.yuzo-list .link-list .yuzo_views_post,.yuzo_icon_views,.yuzo_icon_views{background:none!important}.project-share-overlay.allways-visible-icons,.entry-tags,.shortcode-action-box{box-shadow:0 0 8px -2px #333;border-radius:3px;background:#fff;padding:10px;margin-bottom:20px;background:-moz-linear-gradient(top,#fff 1%,#fff 27%,#e8e8e8 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(1%,#fff),color-stop(27%,#fff),color-stop(100%,#e8e8e8));background:-webkit-linear-gradient(top,#fff 1%,#fff 27%,#e8e8e8 100%);background:-o-linear-gradient(top,#fff 1%,#fff 27%,#e8e8e8 100%);background:-ms-linear-gradient(top,#fff 1%,#fff 27%,#e8e8e8 100%);background:linear-gradient(to bottom,#fff 1%,#fff 27%,#e8e8e8 100%);filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff',endColorstr='#e8e8e8',GradientType=0);height:auto!important;float:left;width:98%;margin-left:1%;box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;-o-box-sizing:border-box;-ms-box-sizing:border-box}.yuzo-list .image-list::before{content:"emd4 club";width:100%;color:#fff!important;z-index:1;bottom:2px;margin-left:2px;font-size:4px!important;text-align:left;box-sizing:border-box;-moz-box-sizing:border-box;position:absolute}.yuzo_wraps{box-shadow:0 0 8px -2px #333;border-radius:3px;background:#fff;padding:10px;background:-moz-linear-gradient(top,#fff 1%,#fff 27%,#e8e8e8 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(1%,#fff),color-stop(27%,#fff),color-stop(100%,#e8e8e8));background:-webkit-linear-gradient(top,#fff 1%,#fff 27%,#e8e8e8 100%);background:-o-linear-gradient(top,#fff 1%,#fff 27%,#e8e8e8 100%);background:-ms-linear-gradient(top,#fff 1%,#fff 27%,#e8e8e8 100%);background:linear-gradient(to bottom,#fff 1%,#fff 27%,#e8e8e8 100%);filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff',endColorstr='#e8e8e8',GradientType=0);height:auto!important;float:left;width:98%;margin-left:1%;box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;-o-box-sizing:border-box;-ms-box-sizing:border-box}a.yuzo__text--title,.yuzo__text--title,.yuzo-list a.yuzo__text--title{font-weight:normal;color:#4a66d6!important;font-size:13px;filter:saturate(4)}.yuzo__title ::before{content:url(data:image/png;base64,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);width:32px;height:32px;display:inline-block;position:relative;top:6px;opacity:.6}.yuzo__title h3,.yuzo__title{display:inline-block}.yuzo_related_post .relatedthumb .yuzo-img-wrap{margin-bottom:0}.yuzo_related_post .yuzo_clearfixed{margin-left:30px}.yuzo_text{filter:saturate(4)!important;font-size:12px!important}.yuzo-list .image-list{box-shadow:0 0 4px 0 rgba(133,164,191,0.75);margin:4px 15px 4px 7px}.yuzo_related_post .relatedthumb .yuzo-img-wrap{width:34px!important;height:48px!important}.yuzo-img{width:32px!important;height:46px!important;border-style:solid!important;border-width:1px!important;border-radius:1px!important;border-color:#308adf!important}.yuzo-list .image-list::before{content:'test text';font-size:28px;text-align:left;width:50%;color:#F00;z-index:1;position:absolute}.yuzo-list .image-list::after{content:url();position:absolute;width:33px;height:21%;bottom:7px;left:9px;background-image:-ms-linear-gradient(top,rgba(255,255,255,0) 0,rgba(48,138,223,1) 41%);background-image:-moz-linear-gradient(top,rgba(255,255,255,0) 0,rgba(48,138,223,1) 41%);background-image:-o-linear-gradient(top,rgba(255,255,255,0) 0,rgba(48,138,223,1) 41%);background-image:-webkit-gradient(linear,left top,left bottom,color-stop(0,rgba(255,255,255,0)),color-stop(41,rgba(48,138,223,1)));background-image:-webkit-linear-gradient(top,rgba(255,255,255,0) 0,rgba(48,138,223,1) 41%);background-image:linear-gradient(to bottom,rgba(255,255,255,0) 0,rgba(48,138,223,1) 41%)}.yuzo_icon_views{float:right;margin-right:7px!important}.entry-meta .post-yuzo-views{float:right;margin-right:7px!important}.entry-meta .post-yuzo-views::after{content:""!important}.vc_single_image-img .img{width:100%;vertical-align:top}article.post:nth-child(n+1)>div:nth-child(1)>a:nth-child(2)>img:nth-child(1),.wp-caption .zoomInUp{margin:-2px}article.post:nth-child(n+1)>div:nth-child(1)>a:nth-child(2)::after,.alignnone:after,.wpb_single_image::after,.mfp-figure>figure:nth-child(2)::after,.fl-post-feed-image::after,div.fl-post-feed-post:nth-child(1)>div:nth-child(8)>a:nth-child(1)>img:nth-child(1)::after{content:"\\a";position:absolute;width:100%;height:100%;bottom:0;left:0;background:-moz-linear-gradient(270deg,rgba(48,138,223,1) 0,rgba(48,138,223,1) 6%,rgba(255,255,255,0) 11%,rgba(255,255,255,0) 81%,rgba(48,138,223,1) 88%,rgba(48,138,223,1) 100%);background:-webkit-gradient(linear,left top,left 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@media(min-width:992px){.vc_col-md-1,.vc_col-md-10,.vc_col-md-11,.vc_col-md-12,.vc_col-md-2,.vc_col-md-3,.vc_col-md-4,.vc_col-md-5,.vc_col-md-6,.vc_col-md-7,.vc_col-md-8,.vc_col-md-9{float:left}.vc_col-md-12{width:100%}.vc_col-md-11{width:91.66666667%}.vc_col-md-10{width:83.33333333%}.vc_col-md-9{width:75%}.vc_col-md-8{width:66.66666667%}.vc_col-md-7{width:58.33333333%}.vc_col-md-6{width:50%}.vc_col-md-5{width:41.66666667%}.vc_col-md-4{width:33.33333333%}.vc_col-md-3{width:25%}.vc_col-md-2{width:16.66666667%}.vc_col-md-1{width:8.33333333%}.vc_col-md-pull-12{right:100%}.vc_col-md-pull-11{right:91.66666667%}.vc_col-md-pull-10{right:83.33333333%}.vc_col-md-pull-9{right:75%}.vc_col-md-pull-8{right:66.66666667%}.vc_col-md-pull-7{right:58.33333333%}.vc_col-md-pull-6{right:50%}.vc_col-md-pull-5{right:41.66666667%}.vc_col-md-pull-4{right:33.33333333%}.vc_col-md-pull-3{right:25%}.vc_col-md-pull-2{right:16.66666667%}.vc_col-md-pull-1{right:8.33333333%}.vc_col-md-pull-0{right:auto}.vc_col-md-push-12{left:100%}.vc_col-md-push-11{left:91.66666667%}.vc_col-md-push-10{left:83.33333333%}.vc_col-md-push-9{left:75%}.vc_col-md-push-8{left:66.66666667%}.vc_col-md-push-7{left:58.33333333%}.vc_col-md-push-6{left:50%}.vc_col-md-push-5{left:41.66666667%}.vc_col-md-push-4{left:33.33333333%}.vc_col-md-push-3{left:25%}.vc_col-md-push-2{left:16.66666667%}.vc_col-md-push-1{left:8.33333333%}.vc_col-md-push-0{left:auto}.vc_col-md-offset-12{margin-left:100%}.vc_col-md-offset-11{margin-left:91.66666667%}.vc_col-md-offset-10{margin-left:83.33333333%}.vc_col-md-offset-9{margin-left:75%}.vc_col-md-offset-8{margin-left:66.66666667%}.vc_col-md-offset-7{margin-left:58.33333333%}.vc_col-md-offset-6{margin-left:50%}.vc_col-md-offset-5{margin-left:41.66666667%}.vc_col-md-offset-4{margin-left:33.33333333%}.vc_col-md-offset-3{margin-left:25%}.vc_col-md-offset-2{margin-left:16.66666667%}.vc_col-md-offset-1{margin-left:8.33333333%}.vc_col-md-offset-0{margin-left:0}}
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@media screen and (max-width:359px){body div.blog-media.wf-td,body .layout-list .blog-media{max-width:110px!important;min-width:88px!important}body div.blog-content.wf-td{float:!important}}
#bottom-bar .mini-nav ul{line-height:22px!important}#bottom-bar .hasCustomSelect option:nth-child(n){color:#308adf!important;-webkit-text-fill-color:#308adf;height:1.5em!important;font-weight:800!important;display:flex!important;padding-top:.4em;font-size:18px}#bottom-bar .mini-nav ul>li.act>a .menu-item-text,#bottom-bar .mini-nav>ul>li>a:hover .menu-item-text,#bottom-bar .customSelect.customSelectHover{text-decoration:none!important}#bottom-bar .wf-float-left:last-of-type{margin-bottom:10px}#theme-my-login1>ul>li:nth-child(n){margin-bottom:10px}`;
const subst = `$1\n`;
// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);
console.log('Substitution result: ', result);
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