$re = '/mat-column-(\w+)[^>]*>(?:<[^>]*>)*([^<]*)/m';
$str = '<mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="6%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-status mat-column-status ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 6%;"><mat-icon _ngcontent-ifd-c336="" role="img" class="mat-icon notranslate mat-tooltip-trigger material-icons app-list-icon-yellow mat-icon-no-color" aria-hidden="true" data-mat-icon-type="font" aria-describedby="cdk-describedby-message-1" cdk-describedby-host=""> info </mat-icon><!----><!----></mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="8%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-taskObjectExternalId mat-column-taskObjectExternalId ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 8%;"><a _ngcontent-ifd-c336="" href="/applications/tab/customer-tab?id=103085"> 101010 </a></mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="12%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-type mat-column-type ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 12%;"><section _ngcontent-ifd-c336="" fxflex="100%" fxlayout="row wrap" style="flex-flow: wrap; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 100%;"><span _ngcontent-ifd-c336="" fxflex="100%" fxlayoutalign="left center" class="extra-info" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 100%;"> WBSO 2023 </span><span _ngcontent-ifd-c336="" fxflex="100%" fxlayoutalign="left center" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 100%;"> Customer approval <!----><!----></span></section></mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="15%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-customerName mat-column-customerName ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 15%;"> Example customer </mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="10%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-creationDate mat-column-creationDate ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 10%;"> 16 Days ago </mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="10%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-deadLine mat-column-deadLine ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 10%;"><!----><span _ngcontent-ifd-c336="" class="ng-star-inserted"> 4 Days left </span><!----><!----><!----><!----><!----></mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="10%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-createdBy mat-column-createdBy ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 10%;"> </mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="8%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-reminderSent mat-column-reminderSent ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 8%;"> 0 </mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="8%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-lastModifiedDate mat-column-lastModifiedDate ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 8%;"> </mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="7%" fxlayoutalign="left center" class="mat-cell cdk-cell cdk-column-visible mat-column-visible ng-star-inserted" style="place-content: center flex-start; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 7%;"><mat-icon _ngcontent-ifd-c336="" role="img" class="mat-icon notranslate material-icons mat-icon-no-color ng-star-inserted" aria-hidden="true" data-mat-icon-type="font"> visibility_on </mat-icon><!----><!----></mat-cell><mat-cell _ngcontent-ifd-c336="" role="cell" fxflex="5%" fxlayoutalign="end center" class="mat-cell cdk-cell cdk-column-actions mat-column-actions ng-star-inserted" style="place-content: center flex-end; align-items: center; flex-direction: row; box-sizing: border-box; display: flex; flex: 1 1 100%; max-width: 5%;"><button _ngcontent-ifd-c336="" mat-icon-button="" class="mat-focus-indicator mat-menu-trigger mat-icon-button mat-button-base" aria-haspopup="true"><span class="mat-button-wrapper"><mat-icon _ngcontent-ifd-c336="" role="img" class="mat-icon notranslate material-icons mat-icon-no-color" aria-hidden="true" data-mat-icon-type="font">settings</mat-icon></span><span matripple="" class="mat-ripple mat-button-ripple mat-button-ripple-round"></span><span class="mat-button-focus-overlay"></span></button><!----><mat-menu _ngcontent-ifd-c336="" class="ng-star-inserted"><!----></mat-menu></mat-cell><!---->';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
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 PHP, please visit: http://php.net/manual/en/ref.pcre.php