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Remove leading, trailing space and leading zeros from string

Posted on 2016-10-05
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Last Modified: 2016-10-05
Hi guys,

I'm using 'parseInt' function to
// Removes all leading and trailing white-space characters from the string and then
// Removes all leading occurrences of the specified character 0 (zeros)

var invoiceId = parseInt(document.getElementById("txtId").value) || "";

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input:                        invoiceId = "   0001abc2345  ";
output result:          invoiceId ="1"   //  'parseInt' function  removes all alpha charters
output required:     invoiceId ="1abc2345"  

Any other way to remove leading and trailing white-space and leading zeros?
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Question by:Darius
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11 Comments
 

Author Comment

by:Darius
ID: 41829831
If no solution on this will try to user Regex....
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Accepted Solution

by:
Julian Hansen earned 500 total points
ID: 41829898
Try this
var src = '00001abacd45';
var result = src.match(/0+(\w+)/)
console.log(result[1]);

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1
 
LVL 53

Assisted Solution

by:Julian Hansen
Julian Hansen earned 500 total points
ID: 41829929
Alternative
	var temp = src.trim();
	var i = 0;
	while(temp[i] == '0' && i++ < temp.length);
	var result = temp.substring(i);

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First one is about 4x faster.
0
 

Author Comment

by:Darius
ID: 41829946
Julian,

it works for :
var src = '00001abacd45';
result:  '1abacd45'

This one gives incorrect result:
var src = '00001aba$_cd45';
result: '1aba'

Acceptation for alphanumeric with one additional character (hyphen)
0
 
LVL 53

Expert Comment

by:Julian Hansen
ID: 41829981
You need to let us know what the data requirements are - your original example did not have an underscore
just change the pattern to /0+([\w_]+)/
	var result = src.match(/0+([\w_]+)/);

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LVL 53

Expert Comment

by:Julian Hansen
ID: 41830004
Belay that the original was fine as it was. Underscore is included in the \w match.

var src = '   00001abac_d45  ';
var result = src.match(/0+(\w+)/);
console.log(result);

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Working sample here
0
 

Author Comment

by:Darius
ID: 41830080
Thank you!  Working!!!

Now I thinking another situation:
How to remove leading trailing white-space and leading zeros only. Other numbers, alphabetic characters and any possible characters to leave as it is.

var src = '   001abc!"$%^&*()_+234  ';
// result:  '1abc!"$%^&*()_+234

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'

Thank you!
0
 

Author Comment

by:Darius
ID: 41830082
var src = '   001abc!"$%^&*()_+234  ';

// result:  '1abc!"$%^&*()_+234'

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0
 
LVL 53

Assisted Solution

by:Julian Hansen
Julian Hansen earned 500 total points
ID: 41830150
	var src = '   001abc!"$%^&*()_+234  ';
	var res = src.trim().match(/0*(.*)/);

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0
 

Author Comment

by:Darius
ID: 41830174
Thanks again...

I tried something similar.  I did mistake by using trim() function...
0
 
LVL 53

Expert Comment

by:Julian Hansen
ID: 41830205
You are welcome.
0

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