正则表达式，排除以特定字符开头的数字(Regex, exclude number starting with certain character)

 我想找到数字，不要继续使用£字符。 说我有一个字符串： 
 
 
 
 “2012年国内生产总值为1270亿英镑” 
 
 
 我想只返回2012年 。 
 
 我试过[^$][0-9]*但这只忽略了$ character。 尝试匹配以数字开头和结尾的整个单词\b[0-9]*\b但是\b仅适用于[0-9a-zA-Z] 
 
 还有什么建议吗？ 

I want to find number with don't proceed with £ character. Say I have a string:
 
 
 
"Gross Domestic Product in 2012 was £127 billion"
 
 
I want to return 2012 only.
 
I ve tried [^$][0-9]* but this only ignores $ character. Tried to match the whole word which starts and ends with number \b[0-9]*\b but \b applies only to [0-9a-zA-Z]
 
Any more suggestions?

原文：https://stackoverflow.com/questions/19514695