blocks|key|1552041|text|自Java+1.5,+yes以来|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1552042|Pattern.quote("$5");|code-block|syntax|javascript|1552043|entityMap|0|LINK|mutability|MUTABLE|url|http://download.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#quote(java.lang.String))^0|1|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Since <a href="http://download.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#quote(java.lang.String)" rel="noreferrer">Java 1.5, yes</a>:

<pre><code>Pattern.quote("$5");
</code></pre>

blocks|key|1767136|text|在我看到以下示例之前，我并不清楚Pattern.quote和Matcher.quoteReplacement之间的区别|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1767137|s.replaceFirst(Pattern.quote("text+to+replace"),+
+++++++++++++++Matcher.quoteReplacement("replacement+text"));|code-block|syntax|javascript|1767138|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#quote-java.lang.String-|1|http://docs.oracle.com/javase/8/docs/api/java/util/regex/Matcher.html#quoteReplacement-java.lang.String-^0|G|D|U|O|G|D|0|U|O|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]|$9|12|A|13|1|14]]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]|S|$5|N|O|P|E|$Q|T]]]]

Difference between <a href="http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#quote-java.lang.String-" rel="noreferrer"><code>Pattern.quote</code></a> and <a href="http://docs.oracle.com/javase/8/docs/api/java/util/regex/Matcher.html#quoteReplacement-java.lang.String-" rel="noreferrer"><code>Matcher.quoteReplacement</code></a> was not clear to me before I saw following example

<pre><code>s.replaceFirst(Pattern.quote("text to replace"), 
 Matcher.quoteReplacement("replacement text"));
</code></pre>

blocks|key|1552248|text|现在响应可能太晚了，但您也可以使用Pattern.LITERAL，它将在格式化时忽略所有特殊字符：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1552249|Pattern.compile(textToFormat,+Pattern.LITERAL);|code-block|syntax|javascript|1552250|entityMap^0|H|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

It may be too late to respond, but you can also use <code>Pattern.LITERAL</code>, which would ignore all special characters while formatting:

<pre><code>Pattern.compile(textToFormat, Pattern.LITERAL);
</code></pre>

blocks|key|1552073|text|我想你要找的是\Q$5\E。另请参阅Java5中引入的Pattern.quote(s)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1552074|有关详细信息，请参阅Pattern+javadoc。|1552075|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html^0|7|6|R|G|0|A|7|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@$9|V|A|W|1|X]]|E|$]]|$1|H|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

I think what you're after is <code>\Q$5\E</code>. Also see <code>Pattern.quote(s)</code> introduced in Java5.

See <a href="http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html" rel="noreferrer">Pattern</a> javadoc for details.

blocks|key|1767185|text|要保护模式，您可以用"\\“替换所有符号，但数字和字母除外。在这之后，你可以把你的特殊符号放在那个受保护的模式中，让这个模式不像愚蠢的引用文本那样工作，而是真的像一个模式，而是你自己的。没有用户特殊符号。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1767186|public+class+Test+{
++++public+static+void+main(String[]+args)+{
++++++++String+str+=+"y+z+(111)";
++++++++String+p1+=+"x+x+(111)";
++++++++String+p2+=+".*+.*+\$111\$";

++++++++p1+=+escapeRE(p1);

++++++++p1+=+p1.replace("x",+".*");

++++++++System.out.println(+p1+%2B+"-->"+%2B+str.matches(p1)+);+
++++++++++++//.*\+.*\+$111$-->true
++++++++System.out.println(+p2+%2B+"-->"+%2B+str.matches(p2)+);+
++++++++++++//.*+.*+$111$-->true
++++}

++++public+static+String+escapeRE(String+str)+{
++++++++//Pattern+escaper+=+Pattern.compile("([%5Ea-zA-z0-9])");
++++++++//return+escaper.matcher(str).replaceAll("\\\\$1");
++++++++return+str.replaceAll("([%5Ea-zA-Z0-9])",+"\\\\$1");
++++}
}|code-block|syntax|javascript|1767187|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To have protected pattern you may replace all symbols with "\\\\", except digits and letters. And after that you can put in that protected pattern your special symbols to make this pattern working not like stupid quoted text, but really like a patten, but your own. Without user special symbols.

<pre><code>public class Test {
 public static void main(String[] args) {
 String str = "y z (111)";
 String p1 = "x x (111)";
 String p2 = ".* .* \$111\$";

 p1 = escapeRE(p1);

 p1 = p1.replace("x", ".*");

 System.out.println( p1 + "--&gt;" + str.matches(p1) ); 
 //.*\ .*\ $111$--&gt;true
 System.out.println( p2 + "--&gt;" + str.matches(p2) ); 
 //.* .* $111$--&gt;true
 }

 public static String escapeRE(String str) {
 //Pattern escaper = Pattern.compile("([^a-zA-z0-9])");
 //return escaper.matcher(str).replaceAll("\\\\$1");
 return str.replaceAll("([^a-zA-Z0-9])", "\\\\$1");
 }
}
</code></pre>

blocks|key|1767338|text|%5E(否定)符号用于匹配不在字符组中的内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1767339|这是到Regular+Expressions的链接|offset|length|1767340|以下是关于否定的图像信息：|1767341|​|1767342|📷|atomic|1767343|1767344|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/39981a07843aef0be40af4b0998b9c65.png|imageAlt^0|0|3|J|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@$D|13|E|14|1|15]]|A|$]]|$1|F|3|G|5|6|7|16|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|17|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|18|8|@]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|M|3|I|5|6|7|1C|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]|V|$5|W|R|X|A|$Y|Z|10|-4]]]]

^(Negation) symbol is used to match something that is not in the character group.

This is the link to <a href="https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference" rel="nofollow noreferrer">Regular Expressions</a>

Here is the image info about negation:

<img src="https://i.stack.imgur.com/m5cXU.png" alt="Info about negation">

Does Java have a built-in way to escape arbitrary text so that it can be included in a regular expression? For example, if my users enter "$5", I'd like to match that exactly rather than a "5" after the end of input.

How to escape text for regular expression in Java

Java

Java有没有内置的方法来转义任意文本，以便将其包含在正则表达式中？例如，如果我的用户输入"$5"，我希望精确匹配，而不是在输入结束后输入"5“。

问如何在Java中转义正则表达式的文本
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回答 6

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