检测字符串的一部分

Question

我想检测一部分字符串

Smith-Waterman score: 275; 46.8% identity (78.5% similar) in 79 aa overlap (1-78:26-103)

我想检测 46.8％并将其作为浮点值存储在变量中

我应该使用什么样的正则表达式？

Answer 1

$a = preg_match('/[0-9]{2,2}.[0-9]{1,1}\%/','Smith-Waterman score: 275; 46.8% identity (78.5% similar) in 79 aa overlap (1-78:26-103)',$ab);
print_r($ab);