问这个RegExp字符串需要转义吗？

EN

const DOCS = [
    "My Report – March 2019.pdf",
    "My Report – May 2019.pdf",
    "My Diary - April-May 2019.pdf",
    "My Diary - February-March 2019.pdf"
]

const title_month_year = new RegExp("(.*) - (January|February|March|April|May|June|July|August|September|October|November|December) (19|20\d{2})")


DOCS.forEach(
    mag = mag.replace(/–/g, "-");
//  if (title_month_year.test(mag)) {   <--- does not match
    if (/(.*) - (January|February|March|April|May|June|July|August|September|October|November|December) (19|20\d{2})/.test(mag)) {
        console.log('we have a match');   
    }