const regex = new RegExp('(?:[!]\\[(?P<caption>.*?)\\])\\((?P<image>.*?)\\)', 'gm')
const str = `This is a regex to detect markdown image links of the form 
Here are some markdown links
- [pandoc-fignos](https://github.com/tomduck/pandoc-fignos): Numbers figures and figure references.
The images section will walk you through how to add and reference images so that the pandoc system can properly number them. For example, this [figure](./ch0_1_images.md#fig:ch0_1_images-1) illustrates a VOD curve for a packaged watergel explosive and this [figure](./ch0_1_images.md#fig:ch0_1_images-2) depicts a circular arc.
## [Equations](./ch0_2_equations.md#sec:ch0_2_equations-1)
The equations section will discuss how to use equations and reference them properly. See the [internal energy equation](./ch0_2_equations.md#eq:ch0_2_equations-1) or the [detonation pressure](./ch0_2_equations.md#eq:ch0_2_equations-2)
This string does not contain any links
Here are some image links:
{#fig:id}
{#fig:id tag="B.1"}
{#fig:ch0_1_images-1 width=100%}
`;
// 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