[LANG-1033] Add StringUtils.countMatches(CharSequence, char)

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.4
• Component/s: lang.*

Environment

Apache Maven 3.2.2 (45f7c06d68e745d05611f7fd14efb6594181933e; 2014-06-17T09:51:42-04:00)
Maven home: C:\Java\apache-maven-3.2.2
Java version: 1.7.0_60, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk1.7.0_60\jre
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"

• Assignee: Gary D. Gregory
• Reporter: Gary D. Gregory
• Created: 06/Aug/14 23:27
• Updated: 06/Apr/15 17:28
• Resolved: 06/Aug/14 23:46

Description

Add:

    /**
     * <p>Counts how many times the char appears in the given string.</p>
     *
     * <p>A {@code null} or empty ("") String input returns {@code 0}.</p>
     *
     * <pre>
     * StringUtils.countMatches(null, *)       = 0
     * StringUtils.countMatches("", *)         = 0
     * StringUtils.countMatches("abba", 0)  = 0
     * StringUtils.countMatches("abba", 'a')   = 2
     * StringUtils.countMatches("abba", 'b')  = 2
     * StringUtils.countMatches("abba", 'x') = 0
     * </pre>
     *
     * @param str  the CharSequence to check, may be null
     * @param ch  the char to count
     * @return the number of occurrences, 0 if the CharSequence is {@code null}
     * @since 3.4
     */
    public static int countMatches(final CharSequence str, final char ch) ...