src/main/java/org/apache/commons/text/StrBuilder.java [1513:1540]:
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        size = 0;
        return this;
    }

    /**
     * Checks if the string builder contains the specified char.
     *
     * @param ch the character to find
     * @return true if the builder contains the character
     */
    public boolean contains(final char ch) {
        final char[] thisBuf = buffer;
        for (int i = 0; i < this.size; i++) {
            if (thisBuf[i] == ch) {
                return true;
            }
        }
        return false;
    }

    /**
     * Tests if the string builder contains the specified string.
     *
     * @param str the string to find
     * @return true if the builder contains the string
     */
    public boolean contains(final String str) {
        return indexOf(str, 0) >= 0;
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src/main/java/org/apache/commons/text/TextStringBuilder.java [1604:1631]:
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        size = 0;
        return this;
    }

    /**
     * Tests if the string builder contains the specified char.
     *
     * @param ch the character to find
     * @return true if the builder contains the character
     */
    public boolean contains(final char ch) {
        final char[] thisBuf = buffer;
        for (int i = 0; i < this.size; i++) {
            if (thisBuf[i] == ch) {
                return true;
            }
        }
        return false;
    }

    /**
     * Tests if the string builder contains the specified string.
     *
     * @param str the string to find
     * @return true if the builder contains the string
     */
    public boolean contains(final String str) {
        return indexOf(str, 0) >= 0;
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