import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^[0-9]* *([a-zA-Z]+[0-9]*)+( *\\+ *[0-9]*([a-zA-Z]{1,2}[0-9]*))* *-> *[0-9]* *([a-zA-Z]+[0-9]*)+( *\\+ *[0-9]*([a-zA-Z]{1,2}[0-9]*))* *; *[a-z][0-9]+( *\\* *[0-9]*([a-zA-Z]{1,2}[0-9]*))*$";
final String string = "2H2 + O2 -> 2H2O; k1*H2*H2*O2\n"
+ "C + O2 -> CO2; k2*C*O2";
final String subst = "";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
// The substituted value will be contained in the result variable
final String result = matcher.replaceAll(subst);
System.out.println("Substitution result: " + result);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html