正则表达式:匹配模式，只要它不在开头 [英] Regex: match pattern as long as it's not in the beginning

问题描述

假设有以下字符串:

aaa bbb ccc
bbb aaa ccc

我想匹配 aaa 只要它不在字符串的开头.我试图通过做这样的事情来否定它:

I want to match aaa as long as it is not at the start of the string. I'm trying to negate it by doing something like this:

[^^]aaa

但我认为这是不对的.使用 preg_replace.

But I don't think this is right. Using preg_replace.

推荐答案

您可以查看后面以确保它不在开头.(?

You can use a look behind to make sure it is not at the beginning. (?<!^)aaa

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