I've a shopify css file with the following content:

```
@font-face{font-family:"Work Sans";font-weight:600;font-style:normal;src:url("https://fonts.shopifycdn.com/work_sans/worksans_n6.136d99375282ffb6ea8c3dc4a8fe189c7be691b2.woff2?&hmac=xxxxxxxxxx") format("woff2"),url("https://fonts.shopifycdn.com/work_sans/worksans_n6.399ae4c4dd52d38e3f3214ec0cc9c61a0a67ea08.woff?&hmac=xxxxxxxxxx") format("woff")}
@font-face{font-family:"Work Sans";font-weight:400;font-style:normal;src:url("https://fonts.shopifycdn.com/work_sans/worksans_n4.29e3afeb38a0ba35e784cf169a40e8beaf814daa.woff2?&hmac=xxxxxxxxxx") format("woff2"),url("https://fonts.shopifycdn.com/work_sans/worksans_n4.e7c533c4afbed28070f6ac45dbcfe6f37840c0a8.woff?&hmac=xxxxxxxxxx") format("woff")}
@font-face{font-family:"Work Sans";font-weight:700;font-style:normal;src:url("https://fonts.shopifycdn.com/work_sans/worksans_n7.35eac55373d3da50c529c81066eb2f2f0fbedb82.woff2?&hmac=xxxxxxxxxx") format("woff2"),url("https://fonts.shopifycdn.com/work_sans/worksans_n7.1b010d40a44f517d5363112c4aff386332758bc9.woff?&hmac=xxxxxxxxxx") format("woff")}
@font-face{font-family:"Work Sans";font-weight:700;font-style:normal;src:url("https://fonts.shopifycdn.com/work_sans/worksans_n7.35eac55373d3da50c529c81066eb2f2f0fbedb82.woff2?&hmac=xxxxxxxxxx") format("woff2"),url("https://fonts.shopifycdn.com/work_sans/worksans_n7.1b010d40a44f517d5363112c4aff386332758bc9.woff?&hmac=xxxxxxxxxx") format("woff")
}.slick-slider{position:relative;display:block;box-sizing:border-box;-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;-ms-touch-action:pan-y;touch-action:pan-y;-webkit-tap-highlight-color:transparent}
....
....

```

I want to extract only @font-face styles from above string using PHP. The result should be like:

```
@font-face{font-family:"Work Sans";font-weight:600;font-style:normal;src:url("https://fonts.shopifycdn.com/work_sans/worksans_n6.136d99375282ffb6ea8c3dc4a8fe189c7be691b2.woff2?&hmac=xxxxxxxxxx") format("woff2"),url("https://fonts.shopifycdn.com/work_sans/worksans_n6.399ae4c4dd52d38e3f3214ec0cc9c61a0a67ea08.woff?&hmac=xxxxxxxxxx") format("woff")}
@font-face{font-family:"Work Sans";font-weight:400;font-style:normal;src:url("https://fonts.shopifycdn.com/work_sans/worksans_n4.29e3afeb38a0ba35e784cf169a40e8beaf814daa.woff2?&hmac=xxxxxxxxxx") format("woff2"),url("https://fonts.shopifycdn.com/work_sans/worksans_n4.e7c533c4afbed28070f6ac45dbcfe6f37840c0a8.woff?&hmac=xxxxxxxxxx") format("woff")}
@font-face{font-family:"Work Sans";font-weight:700;font-style:normal;src:url("https://fonts.shopifycdn.com/work_sans/worksans_n7.35eac55373d3da50c529c81066eb2f2f0fbedb82.woff2?&hmac=xxxxxxxxxx") format("woff2"),url("https://fonts.shopifycdn.com/work_sans/worksans_n7.1b010d40a44f517d5363112c4aff386332758bc9.woff?&hmac=xxxxxxxxxx") format("woff")}
@font-face{font-family:"Work Sans";font-weight:700;font-style:normal;src:url("https://fonts.shopifycdn.com/work_sans/worksans_n7.35eac55373d3da50c529c81066eb2f2f0fbedb82.woff2?&hmac=xxxxxxxxxx") format("woff2"),url("https://fonts.shopifycdn.com/work_sans/worksans_n7.1b010d40a44f517d5363112c4aff386332758bc9.woff?&hmac=xxxxxxxxxx") format("woff")
}

```

Can anyone help me to do this?
Thanks in advance.