Use the chrome extension Chrome Regex Search
https://chrome.google.com/webstore/detail/chrome-regex-search/bpelaihoicobbkgmhcbikncnpacdbknn
Use ctrl + shift + f to search using the extension
Use regex ([0-9]|[1-5][0-9]) minutes ago
P.S. Chrome extensions are risky for privacy P.P.S Most useful for who's hiring threads