const regex = / (?=
({%.if
(?:
(?>
(?:
(?! {%.if | endif.%}) .
)+
)*
| (?1)
)*
endif.%})
)
(?1)/smg;
// Alternative syntax using RegExp constructor
// const regex = new RegExp(' (?=
({%.if
(?:
(?>
(?:
(?! {%.if | endif.%}) .
)+
)*
| (?1)
)*
endif.%})
)
(?1)', 'smg')
const str = `{% if something %}
----------------
{% if something %}
DEEPER
{% endif %}
{% irgendwas %}
{% if something %}
DEEPER
{% if something %}
DEEPEST
{% endif %}
DEEPER
{% endif %}
---- endif ----
{% endif %}
kjafgnkajngkjalkjg
{% if something %}
++++++++++++++++
{% if something %}
DEEPER
{% endif %}
{% irgendwas %}
{% if something %}
DEEPER
{% if something %}
DEEPEST
{% endif %}
DEEPER
{% endif %}
++++ endif ++++
{% endif %}
`;
// 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