const regex = /(?:(?:CASE\s+(?:(?:WHEN\s+.+\s+THEN\s+.+)(?:\s+WHEN\s+.+THEN\s+.+)*)\s+ELSE\s+.+\s+END)(?:,\s*CASE\s+(?:(?:WHEN\s+.+THEN\s+.+)(?:\s+WHEN\s+.+\s+THEN\s+.+)*)\s+ELSE\s+.+\s+END)*)/gi;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?:(?:CASE\\s+(?:(?:WHEN\\s+.+\\s+THEN\\s+.+)(?:\\s+WHEN\\s+.+THEN\\s+.+)*)\\s+ELSE\\s+.+\\s+END)(?:,\\s*CASE\\s+(?:(?:WHEN\\s+.+THEN\\s+.+)(?:\\s+WHEN\\s+.+\\s+THEN\\s+.+)*)\\s+ELSE\\s+.+\\s+END)*)', 'gi')
const str = `CASE
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
ELSE <any_user_defined_value>
END,
CASE
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
ELSE <any_user_defined_value>
END,
CASE
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
WHEN <any_user_defined_condition> THEN <any_user_defined_value>
ELSE <any_user_defined_value>
END`;
// 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