The vertical bar provides alternation in the whole group: ([0-9]*\.?[0-9]+|[0-9]+\.?[0-9]*) It would be easier to read like this; ( [0-9]*\.?[0-9]+ | [0-9]+\.?[0-9]* ) Get the idea?

Title: What is the porpouse of this part ?
Name: CV
Date: 10/24/2003 3:06:44 PM
Comment:
What is the porpouse of this part ? [0-9]+|[0-9]+ Can't it do the same with just [0-9]+ ? What is the difference ?

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