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check if value is lower case

Posted on 2008-10-22
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Last Modified: 2012-05-05
here's a wierd one.

I need to check if a value is lowercase or not

if(document.move_hdr.sess_user3.value.substring(4,5)== A LOWERCASE LETTER)
alert('that can't be lowercase!)

what code is there to replace 'A LOWERCASE LETTER'
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Question by:tampa_vinnie
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Accepted Solution

by:
sh0e earned 250 total points
ID: 22778371

if(document.move_hdr.sess_user3.value.substring(4,5).match(/[a-z]/))
alert('that can't be lowercase!');
 
//or to change it to uppercase
document.move_hdr.sess_user3.value.substring(4,5).toUpperCase();

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Expert Comment

by:Morcalavin
ID: 22778379
Try this.

if(/[^A-Z]/.test(document.move_hdr.sess_user3.value.substring(4,5))
{
//lowercase or not  A - Z(like a ? or ~)
}
else
{
//matches A-Z
}

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Expert Comment

by:hielo
ID: 22778385
if( /[a-z]/.test(document.move_hdr.sess_user3.value.substring(4,5)) )
      alert("that can't be lowercase!");
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Expert Comment

by:ASPSQLServerCOM
ID: 22778402



**********what code is there to replace 'A LOWERCASE LETTER'

http://www.w3schools.com/jsref/jsref_toLowerCase.asp
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Expert Comment

by:hielo
ID: 22778419
>>what code is there to replace 'A LOWERCASE LETTER'
OK, then instead of checking for lowercase, just "force" the input into upper case:
var data = String(document.move_hdr.sess_user3.value.substring(4,5)).toUpperCase();
alert( data );
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Expert Comment

by:hielo
ID: 22778437
>>just "force" the input into upper case:
assuming of course you want only upper case. If you simply want to "remove" any lower case then use:
var data = String(document.move_hdr.sess_user3.value.substring(4,5)).replace(/[a-z]/g,'');
alert( data );
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Expert Comment

by:ASPSQLServerCOM
ID: 22778458
var re = /[a-z]/;
      if(!re.test(document.move_hdr.sess_user3.value.substring(4,5)== )) {
       alert('that can't be lowercase!)
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Expert Comment

by:ASPSQLServerCOM
ID: 22778476
additional ==, use the below code

var re = /[a-z]/;
      if(!re.test(document.move_hdr.sess_user3.value.substring(4,5))) {
       alert('that can't be lowercase!)}

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Author Closing Comment

by:tampa_vinnie
ID: 31508821
thorough, accurate and prompt
thanks much!
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LVL 18

Expert Comment

by:Morcalavin
ID: 22778581
@ASPSQLServerCOM
 
 Putting a ! in front of  the test effectively makes it test the opposite, so you are saying "if not lowercase, alert it is lowercase"
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Expert Comment

by:bluV11t
ID: 22778628
alert("That can't be lowercase!");

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