import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(无|否认)(既往)?[^,。，.]{2,6}过敏史";
final String string = "患者既往体质尚可，否认有“高血压、糖尿病、冠心病”等慢性病病史，否认心、肝、脑、肺、肾“等重大脏器疾病史，否认”肝炎、肺结核等传染病史，否认其他重大手术及外伤史，否认输血及中毒史，呋喃唑酮过敏史，过敏表现：皮疹瘙痒、全身浮肿，否认食物药物过敏史";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
while (matcher.find()) {
System.out.println("Full match: " + matcher.group(0));
for (int i = 1; i <= matcher.groupCount(); i++) {
System.out.println("Group " + i + ": " + matcher.group(i));
}
}
}
}
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