Some regular expressions for finding patterns in text.

Useful regular expressions.md

• Find all references to filenames ending in .js: [^ ]+\.js
• Find all blank lines: ^\r?\n\r?
• Wildcard (any character and newlines): (.|\n)+?
  • Eg find all <td>s, regardless of content: <td>(.|\n)+?</td>
    • Include attribute(s): <td(.|\n)+?>(.|\n)+?</td>
• Convert getComputedStyle(foot1).left to foot1.getBoundingClientRect().x: find getComputedStyle\((.+?)\).left and replace it with $1.getBoundingClientRect().x
• Remove all <a> tags, leaving just the anchor tag text: find <a[^>]*>(.*?)</a> and replace with $1
  • Only links that start with the string /foo: <a href="/foo[^>]*>(.*?)</a>
• Find all URLs: \b(https?):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|]
  • All URLs ending in .jpg: \b(https?):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|](\.jpg)
  • All URLs within href attributes: (href=["'])(\b[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|]). URL available in $2
• Return lines where whole-word strings foo or bar baz occur in the line: ^.*\b(foo|bar baz)\b.*\n? RegExr →
  • Or where foo or bar baz strings occur anywhere in the line: ^.*(foo|bar baz).*\n? RegExr →
• Match every line in a simple CSV file where the line contains the string foo in the second column, but not if the string foo also appears in another column (requires multiline and global flags): ^(?:(?!foo)[^,]*,){1}foo(?:(?:,(?!foo)[^,]*))*$ RegExr →
• Match URL where the domain is not jazzkeys.fyi: ^(?!https?:\/\/(.*\.)?jazzkeys\.fyi)[^ ]+$
• Match .ac, .edu and .gov domains only: (\\.ac\\.[a-zA-Z]{2}?$)|(\\.edu(\\.[a-zA-Z]{2})?$)|(\\.?gov(\\.[a-zA-Z]{1,4})?$)
  • Will match domains like unimelb.edu.au, blogs.gov.scot and gla.ac.uk