Regular Expression - Two Digit Range (23-79)? - regex

Question

I have been reading the regex questions on this site but my issue seems to be a bit different. I need to match a 2 digit number, such as 23 through 75. I am doing this on an HP-UX Unix system. I found examples of 3 - 44 but or any digit number, nothing that is fixed in length, which is a bit surprising, but perhaps I am not understand the variable length example answer.

Answer 1

Since you're not indicating whether this is in addition to any other characters (or in the middle of a larger string), I've included the logic here to indicate what you would need to match the number portion of a string. This should get you there. We're creating a range for the second numbers we're looking for only allowing those characters. Then we're comparing it to the other ranges as an or:
(2[3456789]|[3456][0-9]|7[012345])
As oded noted you can do this as well since sub ranges are also accepted (depends on the implementation of REGEX in the application you're using):
(2[3-9]|[3-6][0-9]|7[0-5])
Based on the title you would change the last 5 to a 9 to go from 75-79:
(2[3-9]|[3-6][0-9]|7[0-9])
If you are trying to match these numbers specifically as a string (from start to end) then you would use the modifiers ^ and $ to indicate the beginning and end of the string.
There is an excellent technical reference of Regex ranges here:
http://www.regular-expressions.info/numericranges.html
If you're using something like grep and trying to match lines that contain the number with other content then you might do something like this for ranges thru 79:
grep "[^0-9]?(2[3-9]|[3-6][0-9]|7[0-9])[^0-9]?" folder

Answer 2

This tool is exactly what you need: Regex_For_Range
From 29 to 79: \b(2[3-9]|[3-7][0-9])\b
From 29 to 75: \b(29|[3-6][0-9]|7[0-5])\b
And just for fun, from 192 to 1742: \b(19[2-9]|[2-9][0-9]{2}|1[0-6][0-9]{2}|17[0-3][0-9]|174[0-2])\b :)

Answer 3

If I want 2 digit range 0-63
/^[0-9]|[0-5][0-9]|6[0-3]$/
[0-9] will allow single digit from 0 to 9
[0-5][0-9] will allow from 00 to 59
6[0-3] will allow from 60 till 63
This way you can take Regular Expression for any Two Digit Range

Answer 4

You have two classes of numbers you want to match:
the digit 2, followed by one of the digits between 3 and 9
one of the digits between 3 and 7, followed by any digit
Edit: Well, that's the title's range (23-79). Within your question (23-75), you have three:
the digit 2, followed by one of the digits between 3 and 9
one of the digits between 3 and 6, followed by any digit
the digit 7, followed by one of the digits between 0 and 5

Answer 5

Just to add to this, here is a solution for generating the string from the accepted answer in javascript. You can click "Run Code Snippet" to enter your own bounds and get your own string.
function regexRangeString(lower,upper){
let current=lower;
let nextRange=function(){
let currentString=String(current);
let len=currentString.length;
let string="";
let newUpper;
for(let digit=0;digit<len;digit++){
let index=len-digit-1;
let lower=Number(currentString[index]);
let thisString="";
for(let u=9;u>=lower;u--){
let us=currentString.substring(0,index)+u+currentString.substring(index+1,len);
if(Number(us)<=upper){
if(lower==u){
thisString=lower;
}
else{
thisString=`[${lower}-${u}]`;
}
currentString=currentString.substring(0,index)+u+currentString.substring(index+1,len);
break;
}
}
if(thisString!="[0-9]"){
string=currentString.substring(0,index)+thisString+string;
break;
}
else{
string=thisString+string
}
}
current=Number(currentString)+1;
return string
}
let string=""
while(current<upper){
string+="|"+nextRange(current);
}
string="("+string.slice(1)+")";
return string
}
let lower=prompt("Enter Lower Bound")
let upper=prompt("Enter Upper Bound")
alert(regexRangeString(lower,upper))
For example:
regexRangeString(72,189)
generates the following output string:
(7[2-9]|[8-9][0-9]|1[0-8][0-9])

Answer 6

This should do it:
/^([2][3-9]|[3-6][0-9]|[7][0-5])$/
^ and $ will make it strict that it will match only 2 numbers, so in case that you have i.e 234 it won't work.