Bookmarklet for hiding DOM header, footer and cookies based on simple regex match

readMode.js

var patterns = [
  /.*?[hH]eader[\s\S]?/,
  /.*?[fF]ooter[\s\S]?/,
  // /.*?[Nn]av[\s\S]?/,
  /.*?[Cc]ookie[\s\S]?/
]
// (?<![cC]ontext).*?[hH]eader[\s\S]*(?![Cc]ontext)
// (?<![cC]ontext).*?[hH]eader[\s\S]*?(?![Cc]ontext)

var contextPattern = /[cC]ontext/

var allTags = document.getElementsByTagName('*')
for (let i = allTags.length - 1; i >= 0; --i) {
  patterns.some((p) => {
    let cur = allTags[i]
    let foundElem = p.test(cur.id) || p.test(cur.className) || p.test(cur.tagName)
    if (
      foundElem &&
      !(
        contextPattern.test(cur.id) ||
        contextPattern.test(cur.className) ||
        contextPattern.test(cur.tagName)
      )
    ) {
      // console.log(
      // `hiding node ${allTags[i]}, ${allTags[i].id}, ${allTags[i].className}, ${allTags[i]
      // .tagName}`
      // )
      allTags[i].style.display = 'none'
      // debugger
    }
  })
}

// Bookrmarklet uglified form:
// javascript:var patterns=[/.*?[hH]eader[\s\S]?/,/.*?[fF]ooter[\s\S]?/,/.*?[Cc]ookie[\s\S]?/],contextPattern=/[cC]ontext/,allTags=document.getElementsByTagName("*");for(let t=allTags.length-1;t>=0;--t)patterns.some(e=>{let a=allTags[t];(e.test(a.id)||e.test(a.className)||e.test(a.tagName))&&!(contextPattern.test(a.id)||contextPattern.test(a.className)||contextPattern.test(a.tagName))&&(allTags[t].style.display="none")});