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    <p>The problem is that the pipe character is a meta-character in regexes. It therefore needs to be escaped if you want to match a literal <code>'|'</code> character.</p> <pre><code>String attrs = "id|fullname|email|title"; String regex = "fullname\\|email"; return attrs.matches(regex); </code></pre> <p>The other problem is that your usecase really needs to be using <code>find</code> rather than <code>matches</code>, and the <code>String</code> API does not support <code>find</code>. This means you need to rewrite it to use an explicit <code>Pattern</code> and <code>Matcher</code>; e.g.</p> <pre><code>String attrs = "id|fullname|email|title"; Pattern regex = Pattern.compile("fullname\\|email"); return regex.matcher(attrs).find(); </code></pre> <p>But even this is not right:</p> <ol> <li>What you really need to do (I think) is match the supplied attributes independent of the order in which the user provides them. </li> <li>Naive regexes above will mismatch if the user enters something like "meaningfullname".</li> </ol> <p>Really, this is getting too complicated to do using regexes. Instead, you are better off with something like this:</p> <pre><code>List&lt;String&gt; attrs = Arrays.asList( new String[] {"id", "fullname", "email", "title"}); String[] suppliedAttrs = supplied.split("\\|"); for (String s: suppliedAttrs) { if (!attrs.contains(s)) { throw new IllegalArgumentException("'" + s + "' is not valid"); } } </code></pre> <p>or if you just want to test if the attributes contain one or more of <code>fullname</code> and <code>email</code></p> <pre><code>String[] suppliedAttrs = supplied.split("\\|"); for (String s: suppliedAttrs) { if (s.equals("fullname") || s.equals("email")) { System.err.println("BINGO!"); } } </code></pre>
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    1. POJava String.matches regex with OR pipe
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    1. COThanks! I actually don't want to match a literal '|' character. I'm just using it as a syntactical means of separating attributes.
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    2. CO@ktm5124 - I figured that out. See my updated answer.
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