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Regular Expression
Test String
Substitution
Match local (relative) URLs in CSS, link, script, and img tags
This regex will match all relative URLs defined in a CSS file or link, script, and img tags. The regex will ignore any remote URLs or DATA URLs - but that could be modified easily to include one or the other or both. You should be able to read the regex and figure out where to make that change. If you want to allow both remote and data URLs, then remove the entire negative lookahead section, defined by this pattern: (?! ... )Comments
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 |
