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Regular Expression
Test String
Substitution
Youtube URL Validator/Matcher (ALL)
This regex can match various types of URLs related to youtube.com E.g http://youtube.com/watch?v=iwGFalTRHDA http://www.youtube.com/watch?v=iwGFalTRHDA&feature=related https://www.youtube.com/channel/UCDZkgJZDyUnqwB070OyP72g https://youtube.com/channel/UCDZkgJZDyUnqwB070OyP72g https://youtube.com/iwGFalTRHDA http://youtu.be/n17B_uFF4cA youtube.com/iwGFalTRHDA youtube.com/n17B_uFF4cA http://www.youtube.com/embed/watch?feature=player_embedded&v=r5nB9u4jjy4 http://www.youtube.com/watch?v=t-ZRX8984sc http://youtu.be/t-ZRX8984scComments
Top Regular Expressions
Url checker with or without http:// or https://
Match string not containing string
Check if a string only contains numbers
Match elements of a url
Match an email address
Validate an ip address
nginx test
Match or Validate phone number
Match html tag
Blocking site with unblocked games
Match dates (M/D/YY, M/D/YYY, MM/DD/YY, MM/DD/YYYY)
Empty String
Checks the length of number and not starts with 0
all except word
Match a valid hostname
Not Allowing Special Characters
10-digit phone number with hyphens
Find any word in a list of words
Validate datetime
Person Name
Match string not containing string
Check if a string only contains numbers
Match elements of a url
Match an email address
Validate an ip address
nginx test
Match or Validate phone number
Match html tag
Blocking site with unblocked games
Match dates (M/D/YY, M/D/YYY, MM/DD/YY, MM/DD/YYYY)
Empty String
Checks the length of number and not starts with 0
all except word
Match a valid hostname
Not Allowing Special Characters
10-digit phone number with hyphens
Find any word in a list of words
Validate datetime
Person Name
Cheat Sheet
| Character classes | |
|---|---|
| . | any character except newline |
| \w \d \s | word, digit, whitespace |
| \W \D \S | not word, digit, whitespace |
| [abc] | any of a, b, or c |
| [^abc] | not a, b, or c |
| [a-g] | character between a & g |
| Anchors | |
| ^abc$ | start / end of the string |
| \b | word boundary |
| Escaped characters | |
| \. \* \\ | escaped special characters |
| \t \n \r | tab, linefeed, carriage return |
| \u00A9 | unicode escaped © |
| Groups & Lookaround | |
| (abc) | capture group |
| \1 | backreference to group #1 |
| (?:abc) | non-capturing group |
| (?=abc) | positive lookahead |
| (?!abc) | negative lookahead |
| Quantifiers & Alternation | |
| a* a+ a? | 0 or more, 1 or more, 0 or 1 |
| a{5} a{2,} | exactly five, two or more |
| a{1,3} | between one & three |
| a+? a{2,}? | match as few as possible |
| ab|cd | match ab or cd |
