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PHP正则表达式的有关问题

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Release： 2016-06-13 12:01:28
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PHP正则表达式的问题
我写了这么一行代码，想匹配一串数字：

preg_match('/\d*/, $line, $match);
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但为什么结果是匹配了一个空串？
------解决方案--------------------
* 表示0个或多个规则字符
空串是0个数字，自然是能匹配到的
------解决方案--------------------
\d+

Related labels：
line match nbsp php
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