const regex = /^Main:\s*\w*\(\s*\)\s*\{ <--[^}]*(?:\}(?! <--)[^}]*)*\} <--$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^Main:\\s*\\w*\\(\\s*\\)\\s*\\{ <--[^}]*(?:\\}(?! <--)[^}]*)*\\} <--$', 'gm')
const str = `Main: Subroutine( )
{ <--
Include(foo = bar )
Call(foo = bar )
Repeat(foo = ibar )
{
Message("Message = bar number {ibar}" foo )
Something( )
Message("Message = foo {bar}" )
}
Message("Message = again {iterations}" )
For(start = foo , end = bar )
{
Comment( )
}
While(foo )
{
Comment( )
}
Comment( )
} <--`;
// 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