Regular Expression for integer numbers in between 18 to 80

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I want to use regular expression for entering integer values in between 18 to 80. Help me to find a proper solution. Thank you.

Posted 23-Dec-14 0:31am

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OriginalGriff · Answer 1 · 2014-12-23T00:39:00

Solution 2

Don't.
Regexes are not good at "value" comparisons. You pretty much have to do something like

^(18|19|2\d|3\d|4\d|5\d|6\d|7\d|80)$

which will work, but...it's pretty nasty.

This kind of validation should be done in code by parsing the user input to a number then checking it's range, not via a regular expression.

Posted 23-Dec-14 0:39am

OriginalGriff

Comments

Maciej Los 23-Dec-14 6:53am

+5

Maciej Los · Answer 2 · 2014-12-23T00:40:00

For range of numbers: 10, 12, 18, 52, 79, 85
pattern: 1[8-9]|[2-7][0-9]|8[0]
matches: 18, 52, 79

More: http://www.regular-expressions.info/numericranges.html[^]

[EDIT]
OriginalGriff is right. Regex may be useful if you would like to find numeric value (from range) in text.

[EDIT 2]
Simple if should be enough:

C#

if(enterednumber>=17 && enterednumber<=80)
{
//true part
}
else
{
//false part
}

or via lambda expressions:

C#

int vfrom = 18;
int vto = 80;
int number = 17;
bool result = number >= vfrom && number <= vto ? true : false;

Console.WriteLine("Does {0} is in between {1} and {2}? Result: {3}", number, vfrom, vto, result);

Result: Does 17 is in between 18 and 80? Result: False