const regex = /^\s*\w+(?:\s+\w+)*?(?:\s*<\w+>)?\s+(\w+)(?=\s*[=;])/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^\\s*\\w+(?:\\s+\\w+)*?(?:\\s*<\\w+>)?\\s+(\\w+)(?=\\s*[=;])', 'gm')
const str = `import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
private final String COMMENTS = "test";
private final String VARIABLE_NAME_REGEX="(\\w*)<?>?\\s*=(?=(?:[^"]|"[^"]*["])*\$)";
String test="test";
String test222;
String includeThisAlso ;
List <String> arr;
List <String> list=null;
private final String COMMENTS = "test";
private List<String> test;
`;
// 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