How to increment and decrement AlphaNumeric string for a given range? - string

Question

I need optimized solution to increment and decrement alphanumeric string value as we do in excel. When I specify alphanumeric string with range then it should give me both decremented n incremented list of values. For e.g I need range of +-10 of alphanumeric string as.
PN - Alpha character may come in start / middle /end
1. A2000018 -> A2000008 to A2000028
2. A39999 -> A39989 to A40009
3. A00005 -> A00001 to A00015
4. AZ00005 -> AZ00001 to AZ00015
5. A342S0004 -> A342S0001 to A342S0014
6. A342S9999 -> A342S9989 to A342S10009
7. 1234A -> 1224A to 1244A
8. 0003A -> 0001A to 0013A

Answer 1

public static List<String> getRangeList(String docNumber, int range) {
List<String> rangeList = new ArrayList<>();
System.out.println("Document Number Received " + docNumber);
/**
* REGEX checks for String value starting with 1 character as alpha and rest numeric
*/
boolean trailingAlphabet = false;
boolean leadingNtrailingAlphabet = false;
boolean leadingNtrailingNumber = false;
String patternStr = "";
if (docNumber.trim().matches("[a-zA-Z]{1,5}[0-9]{1,20}[a-zA-Z]{1,5}$")) { //String docNumber = "AD234SD1234 ";
patternStr = "(.*?)(\\d+)(.*?)$";
leadingNtrailingAlphabet = true;
} else if (docNumber.trim().matches("[0-9]{1,20}[a-zA-Z]{1,5}[0-9]{1,20}+$")) { //String docNumber = "1234AD1234 ";
patternStr = "(\\d+)(.*?)(\\d+)$";
leadingNtrailingNumber = true;
} else if (docNumber.trim().matches("[0-9]{1,20}[a-zA-Z]{1,4}+$")) { //String docNumber = "1234A ";
patternStr = "(\\d+)(.*?)$";
trailingAlphabet = true;
} else if (docNumber.trim().matches("[a-zA-Z]{1,5}[0-9]+$")
|| docNumber.trim().matches("[a-zA-Z]{1,5}[0-9]{1,20}[a-zA-Z]{1,4}[0-9]+$")) {
patternStr = "(.*?)(\\d+)$";
}
Pattern pattern = Pattern.compile(patternStr);
Matcher matcher = pattern.matcher(docNumber.trim());
if (matcher.find()) {
String firstAlpha = "";
String origNumber = "";
String lastAlpha = "";
if (trailingAlphabet) {
firstAlpha = matcher.group(2);
origNumber = matcher.group(1);
} else if (leadingNtrailingAlphabet) {
firstAlpha = matcher.group(1);
origNumber = matcher.group(2);
lastAlpha = matcher.group(3);
} else if (leadingNtrailingNumber) {
firstAlpha = matcher.group(1);
lastAlpha = matcher.group(2);
origNumber = matcher.group(3);
} else {
firstAlpha = matcher.group(1);
origNumber = matcher.group(2);
}
//System.out.println("1 Alpha : " + firstAlpha + " origNNum : " + origNumber + " lastAlpha : " + lastAlpha);
String incrNumStr = origNumber;
String dcrNumStr = origNumber;
for (int i = 0; i < range; i++) {
if (Integer.parseInt(dcrNumStr) - 1 <= 0) {
break;
}
dcrNumStr = String.format("%0" + dcrNumStr.length() + "d", Integer.parseInt(dcrNumStr) - 1);
if (leadingNtrailingNumber) {
rangeList.add(firstAlpha + lastAlpha + dcrNumStr);
} else if (leadingNtrailingAlphabet) {
rangeList.add(firstAlpha + dcrNumStr + lastAlpha);
} else if (trailingAlphabet) {
rangeList.add(dcrNumStr + firstAlpha);
} else {
rangeList.add(firstAlpha + dcrNumStr);
}
}
for (int i = 0; i < range; i++) {
incrNumStr = String.format("%0" + incrNumStr.length() + "d", Integer.parseInt(incrNumStr) + 1);
if (leadingNtrailingNumber) {
rangeList.add(firstAlpha + lastAlpha + incrNumStr);
} else if (leadingNtrailingAlphabet) {
rangeList.add(firstAlpha + incrNumStr + lastAlpha);
} else if (trailingAlphabet) {
rangeList.add(incrNumStr + firstAlpha);
} else {
rangeList.add(firstAlpha + incrNumStr);
}
}
Collections.sort(rangeList);
System.out.println(rangeList);
}
return rangeList;
}