const regex = new RegExp('[ \\t]+\\$[ ]*(?P<in_line>[^$\\n]+?)[ \\t]*\\$[ \\t]+', 'mgs')
const str = `Lorem ipsum dolor sit ame \$ a = \\{ b, c \\} \$ Lorem 100 \\\$ ipsum
\$\$ \\left \\{
\\begin{array}{cl}y_1 =&3 x_1 - x_2 + x_3\\\\y_2 =&2 x_2\\\\y_3 =&x_1 - x_2 + 3 x_3\\end{array}
\\right.
\\Leftrightarrow \\left \\{
\\begin{array}{cl}8 x_1 =&3 y_1 + y_2 -y_3\\\\8 x_2 =&4 y_2\\\\8 x_3 =&-y_1 + y_2 + 3 y_3\\end{array}
\\right.
\$\$
Lorem ipsum dolor
\$\$ \\left \\{
\\begin{array}{cl}y_1 =&3 x_1 - x_2 + x_3\\\\y_2 =&2 x_2\\\\y_3 =&x_1 - x_2 + 3 x_3\\end{array}
\\right.
\\Leftrightarrow \\left \\{
\\begin{array}{cl}8 x_1 =&3 y_1 + y_2 -y_3\\\\8 x_2 =&4 y_2\\\\8 x_3 =&-y_1 + y_2 + 3 y_3\\end{array}
\\right.
\$\$
Lorem ipsum dolor \$\$\$ Lorem ipsum dolor \$\$\$. foo sit ame \$ a = \\{ b, c \\} \$
Il s'installe en ligne de commande avec le gestionnaire de paquets \`opam\`:
\$ opam update
\$ opam install hevea
`;
// 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