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    <p>I assume the language is <strong>Java</strong>. I also assume that you want to validate user input, which <strong><em>expects</em></strong> to contain <strong>only</strong> the percentage.</p> <pre><code>"^\\s*((100(\\.0*)?|\\d{1,2}(\\.\\d*)?|\\.\\d+)%?|PASSED|FAILED)\\s*$" </code></pre> <p>(In Groovy, you don't have to escape the backslash)</p> <pre><code>/^\s*((100(\.0*)?|\d{1,2}(\.\d*)?|\.\d+)%?|PASSED|FAILED)\s*$/ (for Groovy) </code></pre> <p>The regex above will <strong>only</strong> validate numbers between 0.0 to 100.0. It allows arbitrary long number of digits after decimal points, and also allows cases such as <code>.8</code> or <code>45.</code> to pass, since they can be processed. The regex also allows any amount of spaces before and after the input (but not inside).</p> <p><b>EDIT</b></p> <p>To match plain text (ASCII):</p> <pre><code>"^\\s*((100(\\.0*)?|\\d{1,2}(\\.\\d*)?|\\.\\d+)%?|[a-zA-Z.]+)\\s*$" /^\s*((100(\.0*)?|\d{1,2}(\.\d*)?|\.\d+)%?|[a-zA-Z.]+)\s*$/ (for Groovy) </code></pre> <p>This will match text that uses English alphabet character (case-insensitive), and full-period. E.g. <code>sdhSDFHS.sfSDJF.sdfSDJFI</code> will matches the above regex. Note that the current regex does not allow spaces within the text, but if you want to add more characters, add inside the square bracket (character class): <code>[a-zA-Z.]</code>. Check the <a href="http://docs.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html" rel="nofollow">documentation</a> for more details.</p> <p><strong>Testing code</strong> (for Java)</p> <pre><code>String arr[] = {"100%", " .435%", "3%", "0%", "0", ".0", "hdfjs.", " PASSED", "FAILED", "34.5 ", "sdhf.sdfdsf.fsdf ", " 100.0000 ", "-234.4", "-0.1", "34.", "100.0000001", "1000"}; for (String s: arr) System.out.println(s + " " + (s.matches("^\\s*((100(\\.0*)?|\\d{1,2}(\\.\\d*)?|\\.\\d+)%?|[a-zA-Z.]+)\\s*$") ? "matched" : "not matched")); </code></pre> <p><strong>Output</strong></p> <pre><code>100% matched .435% matched 3% matched 0% matched 0 matched .0 matched hdfjs. matched PASSED matched FAILED matched 34.5 matched sdhf.sdfdsf.fsdf matched 100.0000 matched -234.4 not matched -0.1 not matched 34. matched 100.0000001 not matched 1000 not matched </code></pre> <p><strong>EDIT2</strong></p> <p>Change in requirement as mentioned in the discussion: only match from 1.0 to 100.0 inclusive for the percentage:</p> <pre><code>/^\s*((100(\.0*)?|[1-9]\d?(\.\d*)?)%?|[a-zA-Z.]+)\s*$/ (for Groovy) </code></pre> <p>This condition is even more stricter than before, since <code>01.1</code> will not match. If you want to match this case:</p> <pre><code>/^\s*(0*((100(\.0*)?|[1-9]\d?(\.\d*)?)%?)|[a-zA-Z.]+)\s*$/ (for Groovy) </code></pre>
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    1. COI am using groovy language which is based in Java. What I wanted to do here is to give the user an option to either input any string, but not limited to PASSED or FAIL only OR a number which range from 0-100 which may contain % sign, or decimal number.
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    2. CO@chemilleX3: How do you define "any string"? Since "any string" can be an invalid percentage input.
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    3. COI am referring to alphabet characters, and special characters percentage(%) and period(.) only. thank you so much!
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