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PODetermine if Decimal, Fraction or Invalid using Regex
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2013-12-01T10:45:26.877
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How can I determine the input of the user if it is decimal,fraction,mixed fraction or invalid? This is the input that is allowed on my program <pre><code>String[] s = new String[]{ "0",".",".0",".01","1.","1.0","1.01", "1 ","1 1","1/2","1/","1/0", "1 1/1", "1 0/0","1 /","1 /0", "1 0/"}; </code></pre> expected output: <pre><code>0) 0 ---- Zero 1) . ---- Error 2) .0 ---- Zero 3) 0.01 ---- Decimal 4) 1. ---- Decimal(the input 1. should be turned to decimal) 5) 1.0 ---- Decimal 6) 1.01 ---- Decimal 7) 1 ---- Decimal(the input with space after the whole number must be decimal) 8) 1 1 ---- Error(because of the space between the 1) 9) 1/2 ---- Fraction 10) 1/ ---- Error 11) 1/0 ---- Error 12) 1 1/1 ---- Mixed Fraction 13) 1 0/0 ---- Error 14) 1 / ---- Error 15) 1 /0 ---- Error 16) 1 0/ ---- Error </code></pre> Actual Output: <pre><code>0) 0 ---- Zero 1) . ---- Error 2) .0 ---- Zero 3) 0.01 ---- Decimal 4) 1. ---- Error 5) 1.0 ---- Decimal 6) 1.01 ---- Decimal 7) 1 ---- Error 8) 1 1 ---- Mixed Fraction 9) 1/2 ---- Fraction 10) 1/ ---- Fraction 11) 1/0 ---- Fraction 12) 1 1/1 ---- Mixed Fraction 13) 1 0/0 ---- Error 14) 1 / ---- Error 15) 1 /0 ---- Error 16) 1 0/ ---- Error </code></pre> I don't have much knowledge on how to build a good pattern of regex? my code: <pre><code>public class DecimalOrFraction { public static void main(String args[]){ String[] s = new String[]{ "0",".",".0",".01","1.","1.0","1.01", "1 ","1 1","1/2","1/","1/0", "1 1/1", "1 0/0","1 /","1 /0", "1 0/"}; for (int x = 0 ;x<s.length;x++) { if(s[x].matches("[0]?([.][0]{1,3}\\s{0,1})?")){ System.out.println(x+") "+s[x]+" ---- Zero"); } else if(s[x].matches("\\d{0,3}([.]\\d{1,3}\\s{0,1})?")){ System.out.println(x+") "+Float.valueOf(s[x])+" ---- Decimal"); } else if(s[x].matches("[1-9]{1,5}([.]\\d{1,3})?\\s[1-9]\\d{0,2}([/]\\d{0,3})?")){ System.out.println(x+") "+s[x]+" ---- Mixed Fraction"); } else if(s[x].matches("[1-9]\\d{0,4}[/]\\d{0,3}")){ System.out.println(x+") "+s[x]+" ---- Fraction"); } else{ System.out.println(x+") "+s[x]+" ---- Error"); } } } } </code></pre>
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<java><regex>
Title
Determine if Decimal, Fraction or Invalid using Regex
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