src/main/java/org/apache/commons/text/StrBuilder.java [2934:2956]:
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            throw new StringIndexOutOfBoundsException(index);
        }
    }

    /**
     * Validates parameters defining a range of the builder.
     *
     * @param startIndex the start index, inclusive, must be valid
     * @param endIndex   the end index, exclusive, must be valid except that if too large it is treated as end of string
     * @return The new string
     * @throws IndexOutOfBoundsException if the index is invalid
     */
    protected int validateRange(final int startIndex, int endIndex) {
        if (startIndex < 0) {
            throw new StringIndexOutOfBoundsException(startIndex);
        }
        if (endIndex > size) {
            endIndex = size;
        }
        if (startIndex > endIndex) {
            throw new StringIndexOutOfBoundsException("end < start");
        }
        return endIndex;
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src/main/java/org/apache/commons/text/TextStringBuilder.java [3216:3238]:
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            throw new StringIndexOutOfBoundsException(index);
        }
    }

    /**
     * Validates parameters defining a range of the builder.
     *
     * @param startIndex the start index, inclusive, must be valid
     * @param endIndex the end index, exclusive, must be valid except that if too large it is treated as end of string
     * @return A valid end index.
     * @throws StringIndexOutOfBoundsException if the index is invalid
     */
    protected int validateRange(final int startIndex, int endIndex) {
        if (startIndex < 0) {
            throw new StringIndexOutOfBoundsException(startIndex);
        }
        if (endIndex > size) {
            endIndex = size;
        }
        if (startIndex > endIndex) {
            throw new StringIndexOutOfBoundsException("end < start");
        }
        return endIndex;
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