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| import java.util.regex.Pattern;
/**
* RegexpGenerator
*/
public class RegexpGenerator {
public static Pattern generateRegexp(String prototype) {
return Pattern.compile(generateRegexpFrom(prototype));
}
private static String generateRegexpFrom(String prototype) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < prototype.length(); i++) {
char c = prototype.charAt(i);
if (Character.isDigit(c)) {
stringBuilder.append("\\d");
} else if (Character.isLetter(c)) {
stringBuilder.append("\\w");
} else { // falltrought: literal
stringBuilder.append(c);
}
}
return stringBuilder.toString();
}
private static void test(String prototype) {
Pattern pattern = generateRegexp(prototype);
System.out.println(String.format("%s -> %s", prototype, pattern));
if (!pattern.matcher(prototype).matches()) {
throw new AssertionError();
}
}
public static void main(String[] args) {
String[] prototypes = {
"2009/11/12",
"I'm a test",
"me too!!!",
"124.323.232.112",
"ISBN 332212"
};
for (String prototype : prototypes) {
test(prototype);
}
}
} |
