import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "if\\s*(\\((?>[^()]|(?1))*\\))(*SKIP)(*F)|(\\w+)(\\s*<=[^;]*)";
final String string = "always @(posedge clk or negedge rst_n)\n"
+ "if(!rst_n)begin\n"
+ " d1 <= 0; //perl_comment_4\n"
+ " //perl_comment_5\n"
+ " d2 <= 1 //perl_comment_6\n"
+ " + 2;\n"
+ " end\n"
+ "else if( d3 <= d4 && ( d5 <= 3 ) ) begin\n"
+ " d6 <= d7 +\n"
+ " (d8 <= d9 ? 1 : 0);\n"
+ " //perl_comment_7\n"
+ " d10 <= d11 <=\n"
+ " d12\n"
+ " + d13\n"
+ " <= d14 ? 1 : 0;\n"
+ " end";
final String subst = "$2_yes$3";
final Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
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