GSTIN Number Regular Expression
A regular expression to match a valid 15-digit GSTIN number (Goods and Services Tax Identification Number) in India.
/\d{2}[A-Z]{5}\d{4}[A-Z]{1}[A-Z\d]{1}[Z]{1}[A-Z\d]{1}/g
Regex To Match First Numbers In A String
A regular expression to match the first occurrence of a number in a string.
/^\d+/g
Regex To Check If A String Is All Uppercase (Or Lowercase)
A regular expression to check if a string is all uppercase (or lowercase) letters.
/^[^a-z]*$/
Regex To Match Git Repositories
A regular expression to match Git repository URLs.
/((git|ssh|http(s)?)|([email protected][\w\.]+))(:(//)?)([\w\[email protected]\:/\-~]+)(\.git)(/)?/g
Regex To Match All #hashtags In A String
A handy regular expression that can be used to match all #hashtags in strings, like Twitter tweets and Facebook posts.
/(#\w+)/g
Regex To Extract Video ID From Youtube Link
A regular expression to extract Youtube video ID from a link.
/(?<=watch\?v=|/videos/|embed\/|youtu.be\/|\/v\/|watch\?v%3D|%2Fvideos%2F|embed%2F|youtu.be%2F|%2Fv%2F)[^#\&\?\n]*/g
Regex To Match A String With No Whitespace At The Beginning And End
A regular expression that allows you to validate a string with no whitespace at the beginning and end.
/^[^\s]+(\s+[^\s]+)*$/
UK National Insurance Number (NIN) Regular Expression
A regular expression that validates and matches UK National Insurance Number (NIN).
/^(?!BG)(?!GB)(?!NK)(?!KN)(?!TN)(?!NT)(?!ZZ)(?:[A-CEGHJ-PR-TW-Z][A-CEGHJ-NPR-TW-Z])(?:\s*\d\s*){6}([A-D]|\s)$/g
Regex To Match The First Line Of A Text
A regular expression to match the first line of a file. Can be useful in adding more content to the beginning or end of the first line of your code.
/^(.*)$/m
Regex To Match All Whitespace Except New Line
A regular expression to match all whitespaces except new links in your content.
/[^\S\r\n]+/g