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POWhat's wrong with my regex pattern?
 

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  1. POWhat's wrong with my regex pattern?
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    <p>I'm asked to catch any html tag using regular expression: </p> <pre><code>A. &lt;TAG ATTRIBUTE="VALUE"/&gt; or B. &lt;TAG ATTRIBUTE="VALUE"&gt; or C. &lt;TAG/&gt; or D. &lt;TAG&gt; or E. &lt;/TAG&gt; </code></pre> <p>Here is my pattern:</p> <pre><code>/** A pattern that matches a simple HTML markup. Group 1 matches * the initial '/', if present. Group 2 matches the tag. Group * 3 matches the attribute name, if present. Group 4 matches the * attribute value (without quotes). Group 5 matches the closing * '/', if present. */ public static final String HTML_P3 = "&lt;(/)?\\s*([a-zA-Z]+)\\s*([a-zA-Z]+)?\\s*=?\\s*\\\"?([^\\\"]+)?\\\"?\\s*(/)?&gt;"; </code></pre> <p>Here is a snippet of the test given:</p> <pre><code>public static void p3(String name, String markup) throws IOException { out.println("Problem #3."); Scanner inp = new Scanner(new FileReader(name)); while (inp.findWithinHorizon(markup, 0) != null) { MatchResult mat = inp.match(); if (mat.group(1) != null &amp;&amp; (mat.group(5) != null || mat.group(3) != null)) { out.printf("Bad markup.%n"); continue; } out.printf("Tag: %s", mat.group(2)); if (mat.group(3) != null) { out.printf(", Attribute: %s, Value: \"%s\"", mat.group(3), mat.group(4)); } if (mat.group(5) != null || mat.group(1) != null) { out.print(" end"); } out.println(); } out.println(); } </code></pre> <p>Here is the input:</p> <pre><code>This is a simple &lt;i&gt;mark-up&lt;/i&gt;. Next comes one &lt;input value="3"/&gt; that's closed, followed by a list of names: &lt;ol color="green"&gt; &lt;li&gt; Tom &lt;/li&gt; &lt;li &gt; Dick &lt;/li&gt; &lt;li&gt; Harry &lt;/li&gt; &lt;/ol&gt; </code></pre> <p>The correct answer should be:</p> <pre><code>Problem #3. Tag: i Tag: i end Tag: input, Attribute: value, Value: "3" end Tag: ol, Attribute: color, Value: "green" Tag: li Tag: li end Tag: li Tag: li end Tag: li Tag: li end Tag: ol end </code></pre> <p>However, I can never catch any ending tag, and here is my output:</p> <pre><code>Problem #3. Tag: i Tag: input, Attribute: value, Value: "3" end Tag: ol, Attribute: color, Value: "green" Tag: li </code></pre> <p>I've tried using regexpal.com and my pattern matches everything. Can someone shed some lights please?</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USIann Wu
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. PO
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      1. PTAnswer
    1. VO
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      1. POWhat's wrong with my regex pattern?
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      1. VTUpMod
    2. VO
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      1. POWhat's wrong with my regex pattern?
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      1. VTUpMod
    1. COYep, the regex does look good: http://regexr.com?36tvb
      singulars
      1. POWhat's wrong with my regex pattern?
      1. USRay Toal
 

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