const regex = /<emphasis>(.*) Code<\/emphasis>\s*<\/para>\s*<program ?(language="(.*)")?>\s*(.*)<\/program>/msg;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('<emphasis>(.*) Code<\\\/emphasis>\\s*<\\\/para>\\s*<program ?(language="(.*)")?>\\s*(.*)<\\\/program>', 'msg')
const str = ` <section id="foo">
<title>Code about Bears</title>
<para>Words</para>
<para><emphasis>Python Code</emphasis></para>
<program language="py">import bears</program>
<para><emphasis>JavaScript Code</emphasis></para>
<program language="js">var bear = require('bears');</program>
<section id="bar">
<title>Code about Bear Cubs</title>
<para>Words</para>
<para><emphasis>Python Code</emphasis></para>
<program language="py">import cubs</program>
<para><emphasis>JavaScript Code</emphasis></para>
<program language="js">var cub = require('cubs');</program>
</section>
</section>`;
// 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