用（\\？）替换问号（？） [英] Replace a question mark (?) with (\\?)

问题描述

我正在尝试定义一个模式以匹配文本中的问号（？）。在正则表达式中，问号被认为是一次或完全没有。 那么我可以用（\\？）来替换文本中的（？）号来修复模式问题吗？

I am trying to define a pattern to match text with a question mark (?) inside it. In the regex the question mark is considered a 'once or not at all'. So can i replace the (?) sign in my text with (\\?) to fix the pattern problem ?

String text = "aaa aspx?pubid=222 zzz";
Pattern p = Pattern.compile( "aspx?pubid=222" );
Matcher m = p.matcher( text );

if ( m.find() )
 System.out.print( "Found it." );
else
 System.out.print( "Didn't find it." );  // Always prints.

推荐答案

你需要逃避？在 正则表达式中为 \\？而不是文本 。

You need to escape ? as \\? in the regular expression and not in the text.

Pattern p = Pattern.compile( "aspx\\?pubid=222" );

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您还可以使用报价 Pattern 类引用正则表达式元字符的方法，这种方式 无需担心引用他们：

You can also make use of quote method of the Pattern class to quote the regex meta-characters, this way you need not have to worry about quoting them:

Pattern p = Pattern.compile(Pattern.quote("aspx?pubid=222"));

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