问题描述
我非常确定正则表达式是可行的，但每当我尝试计算出特定的正则表达式时，我的头都会受伤。
I'm pretty sure regular expressions are the way to go, but my head hurts whenever I try to work out the specific regular expression.
正则表达式做什么我需要找到一个Java String（包含文本ERROR或文本WARNING）AND（包含文本parsing），其中所有匹配都不区分大小写？
What regular expression do I need to find if a Java String (contains the text "ERROR" or the text "WARNING") AND (contains the text "parsing"), where all matches are case-insensitive?
编辑：我提出了一个具体案例，但我的问题更为笼统。可能还有其他条款，但它们都涉及匹配特定单词，忽略大小写。可能有1,2,3或更多条款。
I've presented a specific case, but my problem is more general. There may be other clauses, but they all involve matching a specific word, ignoring case. There may be 1, 2, 3 or more clauses.
推荐答案
如果你对正则表达式不是很满意，请不要不要试图将它们用于这样的事情。只需这样做：
If you're not 100% comfortable with regular expressions, don't try to use them for something like this. Just do this instead:
string s = test_string.toLowerCase();
if (s.contains("parsing") && (s.contains("error") || s.contains("warning")) {
....
因为当您在六个月后回到代码时，您一眼就能理解它。
because when you come back to your code in six months time you'll understand it at a glance.
编辑：这是一个正则表达式：
Here's a regular expression to do it:
(?i)(?=.*parsing)(.*(error|warning).*)
但它的效率相当低。对于你有OR条件的情况，你可以搜索几个简单的正则表达式并将编程结果与Java结合起来的混合方法通常是最好的，无论是在可读性还是效率方面。
but it's rather inefficient. For cases where you have an OR condition, a hybrid approach where you search for several simple regular expressions and combine the results programmatically with Java is usually best, both in terms of readability and efficiency.
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