检测字符串

Question

我想检测串

A部分

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

我想检测46.8％，它在一个变量存储为浮点值

我应该使用什么样的正则表达式部分？

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);