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Date: Tue, 6 Jun 2006 14:55:30 +0000 (GMT+00:00)
From: "analogue (JIRA)" <jira@apache.org>
To: commons-dev@jakarta.apache.org
Subject: [jira] Commented: (LANG-263) [lang] Add
 StringUtils.containsIgnoreCase(...)
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    [ http://issues.apache.org/jira/browse/LANG-263?page=comments#action_12414966 ] 

analogue commented on LANG-263:
-------------------------------

    /**
     * <p>Checks if String contains a search String irrespective of case, 
     * handling <code>null</code>. This method uses 
     * {@link #contains(String, String)}.</p>
     *
     * <p>A <code>null</code> String will return <code>false</code>.</p>
     *
     * <pre>
     * StringUtils.contains(null, *)     = false
     * StringUtils.contains(*, null)     = false
     * StringUtils.contains("", "")      = true
     * StringUtils.contains("abc", "")   = true
     * StringUtils.contains("abc", "a")  = true
     * StringUtils.contains("abc", "z")  = false
     * StringUtils.contains("abc", "A")  = true
     * StringUtils.contains("abc", "Z")  = false
     * </pre>
     *
     * @param str  the String to check, may be null
     * @param searchStr  the String to find, may be null
     * @return true if the String contains the search String irrespective of 
     *         case or false if not or <code>null</code> string input
     */
    public static boolean containsIgnoreCase(String str, String searchStr) {
        if (str == null || searchStr == null) {
            return false;
        }
        return contains(str.toUpperCase(), searchStr.toUpperCase());
    }


    public void testContainsIgnoreCase_StringString() {
        assertFalse(StringUtils.containsIgnoreCase(null, null));
        
        // Null tests
        assertFalse(StringUtils.containsIgnoreCase(null, ""));
        assertFalse(StringUtils.containsIgnoreCase(null, "a"));
        assertFalse(StringUtils.containsIgnoreCase(null, "abc"));
        
        assertFalse(StringUtils.containsIgnoreCase("", null));
        assertFalse(StringUtils.containsIgnoreCase("a", null));
        assertFalse(StringUtils.containsIgnoreCase("abc", null));
        
        // Match len = 0
        assertTrue(StringUtils.containsIgnoreCase("", ""));
        assertTrue(StringUtils.containsIgnoreCase("a", ""));
        assertTrue(StringUtils.containsIgnoreCase("abc", ""));

        // Match len = 1
        assertFalse(StringUtils.containsIgnoreCase("", "a"));
        assertTrue(StringUtils.containsIgnoreCase("a", "a"));
        assertTrue(StringUtils.containsIgnoreCase("abc", "a"));
        assertFalse(StringUtils.containsIgnoreCase("", "A"));
        assertTrue(StringUtils.containsIgnoreCase("a", "A"));
        assertTrue(StringUtils.containsIgnoreCase("abc", "A"));
        
        // Match len > 1 
        assertFalse(StringUtils.containsIgnoreCase("", "abc"));
        assertFalse(StringUtils.containsIgnoreCase("a", "abc"));
        assertTrue(StringUtils.containsIgnoreCase("xabcz", "abc"));
        assertFalse(StringUtils.containsIgnoreCase("", "ABC"));
        assertFalse(StringUtils.containsIgnoreCase("a", "ABC"));
        assertTrue(StringUtils.containsIgnoreCase("xabcz", "ABC"));
    }

> [lang] Add StringUtils.containsIgnoreCase(...)
> ----------------------------------------------
>
>          Key: LANG-263
>          URL: http://issues.apache.org/jira/browse/LANG-263
>      Project: Commons Lang
>         Type: New Feature

>     Reporter: analogue
>     Priority: Minor
>      Fix For: 3.0

>
> To complement StringUtils.equalsIgnoreCase(...), StringUtils.containsIgnoreCase(...) would be quite useful.  A simple implementation would uppercase both strings and delegate to StringUtils.contains(...).

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