const regex = /(?<=^(?:(?:Lung|LUNG) RADS:?(?: CATEGORY:?| [cC]ategory:?)? ?|LUNGRADS? |LUNG-RAD ))(?:\d[A-Z]?|[A-Z])(?![A-Z])/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?<=^(?:(?:Lung|LUNG) RADS:?(?: CATEGORY:?| [cC]ategory:?)? ?|LUNGRADS? |LUNG-RAD ))(?:\\d[A-Z]?|[A-Z])(?![A-Z])', 'gm')
const str = `LUNG RADS CATEGORY 2
Lung RADS category 1,
Lung RADS category 2.
LUNG RADS CATEGORY 1:
Lung RADS 3S.
Lung RADS Category 1:
Lung RADS Category 1 (S):
LUNG RADS CATEGORY 1 S
Lung RADS category: 2S.
Lung RADS: 2C
Lung RADS category 4B,
Lung RADS category 1S.
Lung RADS: 3.
Lung RADS category I
Lung RADS 2
LUNG RADS CATEGORY:I
LUNGRADS 2
LUNGRAD 2
LUNG-RAD 3
`;
// 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