Java String Match Count countMatches(String str, String sub)

Description

count Matches

License

Apache License

Declaration

public static int countMatches(String str, String sub) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    public static final int INDEX_NOT_FOUND = -1;

    public static int countMatches(String str, String sub) {
        if (!hasText(str) || !hasText(sub)) {
            return 0;
        }/*from  w  w  w . java  2  s  .  c om*/
        int count = 0;
        int idx = 0;
        while ((idx = str.indexOf(sub, idx)) != INDEX_NOT_FOUND) {
            count++;
            idx += sub.length();
        }
        return count;
    }

    public static boolean hasText(String str) {
        return str != null && !str.trim().isEmpty();
    }

    /**
     * Removes the leading and trailing occurence of the string trim.
     * <p/>
     * trim("||||FOO|BAR|||||","|") => FOO|BAR
     *
     * @param str
     * @param trim
     * @return
     */
    public static String trim(String str, String trim) {
        str = trimLeading(str, trim);
        str = trimTrailing(str, trim);
        return str;
    }

    /**
     * Removes the leading occurence of the string trim.
     * <p/>
     * trim("||||FOO|BAR|||||","|") => FOO|BAR|||||
     *
     * @param str
     * @param trim
     * @return
     */
    public static String trimLeading(String str, String trim) {
        while (str.startsWith(trim)) {
            str = str.substring(trim.length());
        }
        return str;
    }

    /**
     * Removes the trailing occurence of the string trim.
     * <p/>
     * trim("||||FOO|BAR|||||","|") => ||||FOO|BAR
     *
     * @param str
     * @param trim
     * @return
     */
    public static String trimTrailing(String str, String trim) {
        while (str.endsWith(trim)) {
            str = str.substring(0, str.length() - trim.length());
        }
        return str;
    }
}

Related

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2. countMatches(String str, String match)
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