Find the full tag
Write a regexp to find the tag <style...>. It should match the full tag: it may have no attributes <style> or have several of them <style type="..." id="...">.
…But the regexp should not match <styler>!
For instance:
let regexp = /your regexp/g;
alert( '<style> <styler> <style test="...">'.match(regexp) ); // <style>, <style test="...">The pattern start is obvious: <style.
…But then we can’t simply write <style.*?>, because <styler> would match it.
We need either a space after <style and then optionally something else or the ending >.
In the regexp language: <style(>|\s.*?>).
In action:
let regexp = /<style(>|\s.*?>)/g;
alert( '<style> <styler> <style test="...">'.match(regexp) ); // <style>, <style test="...">