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Top Forums Shell Programming and Scripting Regex to validate parameter for sleep Post 303025524 by Ralph on Monday 5th of November 2018 08:10:03 AM
Old 11-05-2018
Regex to validate parameter for sleep

I'm trying to use a regular expression to validate a value for sleep entered by the user. The test should fail all negative values and 0 but let pass all combinations of + . and digits that would amount to a valid parameter for sleep.
Examples for valid: 1, 1.5, .5, 0.5, +1, +.5, +1.3 etc.
Examples for invalid: 0, .0, 0., 0.0, +0, +.0, +0, +0.0 etc. and any string starting with a -

I wrote a small program to test the regular expressions I'm using now - two expressions combined in a test statement. While looking a bit contrived they almost do the job except that strings like .1.1 still pass the test as valid.

Can someone help me take the final step?

Code:
#!/bin/bash

if [ $# -gt 0 ] ; then # user entered parameter for sleep
   # check fails if it's not a positive floating point number
   if ! [[ $1 =~ ^\+?\.?[0-9]+\.?[0-9]*$ ]] || [[ $1 =~ ^[\+-]?0?\.?0*$ ]]; then
      echo invalid value for sleep: $1
   else
     echo valid: $1
   fi
fi

Thanks.

------ Post updated at 01:08 PM ------

I found a solution by adding an && clause to the if condition:

Code:
if ! [[ $1 =~ ^\+?\.?[0-9]+\.?[0-9]*$ ]] || [[ $1 =~ ^[\+-]?0?\.?0*$ ]] && ! [[ $1 =~ ^\.*$ ]

but it looks even more contrived now.

Is there a way to solve the problem within one regular expression? Or something much shorter? (I'm not overly familiar with regular expressions and I expect an expert to come up easily with something shorter, humiliatingly shorter.)

------ Post updated at 01:10 PM ------

OMG. There's a ] missing at the end.
 

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XML::LibXML::Schema(3)					User Contributed Perl Documentation				    XML::LibXML::Schema(3)

NAME
XML::LibXML::Schema - XML Schema Validation SYNOPSIS
use XML::LibXML; $doc = XML::LibXML->new->parse_file($url); $xmlschema = XML::LibXML::Schema->new( location => $filename_or_url ); $xmlschema = XML::LibXML::Schema->new( string => $xmlschemastring ); eval { $xmlschema->validate( $doc ); }; DESCRIPTION
The XML::LibXML::Schema class is a tiny frontend to libxml2's XML Schema implementation. Currently it supports only schema parsing and document validation. As of 2.6.32, libxml2 only supports decimal types up to 24 digits (the standard requires at least 18). METHODS
new $xmlschema = XML::LibXML::Schema->new( location => $filename_or_url ); $xmlschema = XML::LibXML::Schema->new( string => $xmlschemastring ); The constructor of XML::LibXML::Schema may get called with either one of two parameters. The parameter tells the class from which source it should generate a validation schema. It is important, that each schema only have a single source. The location parameter allows to parse a schema from the filesystem or a URL. The string parameter will parse the schema from the given XML string. Note that the constructor will die() if the schema does not meed the constraints of the XML Schema specification. validate eval { $xmlschema->validate( $doc ); }; This function allows to validate a (parsed) document against the given XML Schema. The argument of this function should be a XML::LibXML::Document object. If this function succeeds, it will return 0, otherwise it will die() and report the errors found. Because of this validate() should be always evaluated. AUTHORS
Matt Sergeant, Christian Glahn, Petr Pajas VERSION
1.88 COPYRIGHT
2001-2007, AxKit.com Ltd. 2002-2006, Christian Glahn. 2006-2009, Petr Pajas. perl v5.12.5 2011-09-21 XML::LibXML::Schema(3)
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