It says zero or even more prevalence of whitespace figures, accompanied by a comma and afterwards accompanied by zero or even more incidence of whitespace figures.
Those people two replaceAll calls will generally generate precisely the same outcome, despite what x is. On the other hand, it is crucial to note the two regular expressions are certainly not the identical:
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This is particularly critical for customers of our Neighborhood who are newbies, and not acquainted with the syntax. On condition that, is it possible to edit your response to include an evidence of That which you're undertaking and why you believe it is the greatest technique?
This is often relatively conventional error-checking code for your Python script that accepts command-line arguments.
The 1st regex will match one whitespace character. The second regex will reluctantly match a number of whitespace people. For some purposes, both of these regexes are extremely equivalent, besides in the second case, the regex can match more of the string, if it helps prevent the regex match from failing. from
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And since your next parameter is vacant string "", there is no difference between the output of two instances.
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The width just isn't specified in the structure string, but as a further integer worth argument previous the argument that should be formatted.
If the value being output is below 4 character positions huge, the value is true justified in the field by default.
If the value is larger than four character positions wide, the sector width expands to support the right quantity of figures.
The subsequent if statement checks to determine if the 'databases-name' you handed on the script truly exists around the filesystem. Otherwise, you'll get a information like this: