src/main/java/org/apache/commons/text/StrSubstitutor.java [553:588]:
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        substitute(buf, 0, length);
        return buf.toString();
    }

    /**
     * Replaces all the occurrences of variables with their matching values
     * from the resolver using the given source as a template.
     * The source is not altered by this method.
     *
     * @param source  the buffer to use as a template, not changed, null returns null
     * @return The result of the replace operation
     */
    public String replace(final CharSequence source) {
        if (source == null) {
            return null;
        }
        return replace(source, 0, source.length());
    }

    /**
     * Replaces all the occurrences of variables with their matching values
     * from the resolver using the given source as a template.
     * The source is not altered by this method.
     * <p>
     * Only the specified portion of the buffer will be processed.
     * The rest of the buffer is not processed, and is not returned.
     * </p>
     *
     * @param source  the buffer to use as a template, not changed, null returns null
     * @param offset  the start offset within the array, must be valid
     * @param length  the length within the array to be processed, must be valid
     * @return The result of the replace operation
     */
    public String replace(final CharSequence source, final int offset, final int length) {
        if (source == null) {
            return null;
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src/main/java/org/apache/commons/text/StringSubstitutor.java [828:863]:
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        substitute(buf, 0, length);
        return buf.toString();
    }

    /**
     * Replaces all the occurrences of variables with their matching values from the resolver using the given source as
     * a template. The source is not altered by this method.
     *
     * @param source the buffer to use as a template, not changed, null returns null
     * @return The result of the replace operation
     * @throws IllegalArgumentException if variable is not found when its allowed to throw exception
     */
    public String replace(final CharSequence source) {
        if (source == null) {
            return null;
        }
        return replace(source, 0, source.length());
    }

    /**
     * Replaces all the occurrences of variables with their matching values from the resolver using the given source as
     * a template. The source is not altered by this method.
     * <p>
     * Only the specified portion of the buffer will be processed. The rest of the buffer is not processed, and is not
     * returned.
     * </p>
     *
     * @param source the buffer to use as a template, not changed, null returns null
     * @param offset the start offset within the array, must be valid
     * @param length the length within the array to be processed, must be valid
     * @return The result of the replace operation
     * @throws IllegalArgumentException if variable is not found when its allowed to throw exception
     */
    public String replace(final CharSequence source, final int offset, final int length) {
        if (source == null) {
            return null;
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