从字符串中提取美元金额 - PHP中的正则表达式

Question

我在为所有可能的字符串可靠地执行此操作提出了挑战。

这里是$ str中的可能值：

有一个新的$ 66的目标价
有一个新的$ 105.20的价格目标
有一个新的$ 25.20的目标价

我想要一个新的$ dollar_amount从上面的示例字符串中提取美元金额。例如在上述情况下$ dollar_amount = 66/105.20/25.20。我如何可靠地做到这一点与PHP中的正则表达式？由于

Answer 1

preg_match('/\$([0-9]+[\.]*[0-9]*)/', $str, $match); 
$dollar_amount = $match[1]; 

很可能是最合适的一个

Answer 2

尝试

#.+\$(.+)\s.+# 

---

Answer 3

试试这个：

if (preg_match('/(?<=\$)\d+(\.\d+)?\b/', $subject, $regs)) { 
    #$result = $regs[0]; 
} 

说明：

" 
(?<=  # Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) 
    \$  # Match the character “\$” literally 
) 
\d  # Match a single digit 0..9 
    +  # Between one and unlimited times, as many times as possible, giving back as needed (greedy) 
(  # Match the regular expression below and capture its match into backreference number 1 
    \.  # Match the character “.” literally 
    \d  # Match a single digit 0..9 
     +  # Between one and unlimited times, as many times as possible, giving back as needed (greedy) 
)?  # Between zero and one times, as many times as possible, giving back as needed (greedy) 
\b  # Assert position at a word boundary 
" 

Answer 4

你需要这样的正则表达式：

/(\$([0-9\.]+))/ 

什么是满足您的需求是由你的功能。

你可以找到那么正则表达式函数PHP这里：http://www.php.net/manual/en/ref.pcre.php