const regex = /(无|否认)(既往)?[^,。，.]{2,6}过敏史/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(无|否认)(既往)?[^,。，.]{2,6}过敏史', 'gm')
const str = `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`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
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 JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions