PHP正则表达式保存以特定字符开头的单词

Question

though Id figured this out but need your help I need to find words that start with fa- in a string the following works

$anchor_css = $item->anchor_css;
if (preg_match_all("/fa\-(\w+)/", $anchor_css, $fa)){   //look for a font awsome class name beginning with fa- if found the lass name is stored in $out[0][0]
    $anchor_css = preg_replace("/fa\-(\w+)/", "", $anchor_css); //remove the font awsome class name starting with fa-
    $anchor_css = preg_replace("/fa/", "", $anchor_css);    //remove the fa prefix from the class
    $anchor_css = preg_replace('!\s+!', ' ', $anchor_css);  //remove multiple spaces and replace with a single space
}
$fa_icon = $fa[0][0] ? '<i class="fa '.implode(' ',$fa[0]).'" ></i>' :'';   //if a font awsome class name exists, create an <i></i> tag

the above works for 'test fa fa-info fa-lg'
the result being
anchor_css='test' fa_icon= 'fa fa-info fa-lg'
however it does not work for fa-info-circle fa-lg where the results are anchor_css='test'
fa_icon= 'fa fa-info fa-lg'

I know it is happening because \\w does not inclue the hyphen but have no idea how to get around this. Help please.

Answer 1

Though your question is not really clear I guess you need somethings like this in line 3

$anchor_css = preg_replace("/fa[-_](\w+)/", "", $anchor_css);

If you'd explain more what do you want to achieve then someone could give you better solution.