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Compare string length to a number

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# 8  
Old 08-22-2016
Hi.

Needing to compare $var to the pattern of digits, so could be:
Code:
if [[ "$var" =~ [0-9]{8} ]]

Best wishes ... cheers, drl
This User Gave Thanks to drl For This Post:
Scrutinizer
# 9  
Old 08-23-2016
Quote:
Originally Posted by drl
Hi.

Needing to compare $var to the pattern of digits, so could be:
Code:
if [[ "$var" =~ [0-9]{8} ]]

Best wishes ... cheers, drl
In that case regex anchors would need to be used to ensure it begins with digits and/or that it is precisely 8 digits long..
for example (in recent bash / ksh93):
Code:
if [[ $var =~ ^[0-9]{8}$ ]]

or
Code:
if [[ $name =~ ^[0-9]{8}_ ]]

Last edited by Scrutinizer; 08-23-2016 at 11:03 PM.. Reason: Changed $i1 to $var - tanks drl
This User Gave Thanks to Scrutinizer For This Post:
drl
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