How about the statement of regular expression like for this

Question

I what to get varians String array by one regular express for the statement like:
${user} like play ${game} in ${date}
I want to get String[] as {"user","game","date"} by one regex, by str.split(regex). I tried many times but always fail to get the result I expected. May it be possible to meet the destination?
thanks in advance
Frederick

Answer 1

why StringBuffer was using here?So one could split the pattern into multiple lines. But it just occurred to me that one could just use string concatenation, which would look better. I don't know why I bothered to use StringBuffefer.
e.g.:
String pattern =
    "^" +           // the start of a string
    "(dog)|(cat)" + // match either "dog" or "cat" at the start of the line
    "\\s*" +        // match an arbitrary amount of whitespace
    "$";            // but don't allow anything other than whitespace after dog or cat
Pattern p = Pattern.compile(pattern);
Pattern p = Pattern.compile("^(dog)|(cat)\\s*$");> isn't this look more simpler and better?
In this case, yes. I was looking for a way to make regexps more explicit, with whitespace and comments, for more complicated cases.
But those double quotes and plus signs add ugliness of their own, so a regexp would have to be pretty complex before it would be an improvement.