Question

I’m new to regular expressions and I need to find a regular expression that matches one or more digits [1-9] only ONE ‘|’ sign, one or more ‘*’ sign and zero or more ‘,’ sign.

The string should not contain any other characters.
This is what I have:

if(this.ruleString.matches("^[1-9|*,]*$"))  
{  
    return true;  
}

Is it correct?
Thanks,
Vinay

Answer 1

I think you should test separately for every type of symbols rather than write complex expression.

First, test that you don’t have invalid symbols – "^[0-9|*,]$"

Then test for digits "[1-9]", it should match at least one.

Then test for "\\|", "\\*" and "\\," and check the number of matches.

If all test are passed then your string is valid.