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Regular Expression
- flags
Test String
Substitution
Validate datetime
YYYY-MM-DD HH:MM:SSComments
Top Regular Expressions
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
Match or Validate phone number
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
Match a valid hostname
Match IPv6 Address
email validation
RegEx Allowing Number Only
Match an MD5 hash
Checks wheter the given number starts with a given number
Escape one or more asterisks (\*+)
Match a bitcoin address
url
Strip non-digits
Namespace Prefix
Check if a string only contains numbers
Match elements of a url
Match an email address
Validate an ip address
Match or Validate phone number
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
Match a valid hostname
Match IPv6 Address
email validation
RegEx Allowing Number Only
Match an MD5 hash
Checks wheter the given number starts with a given number
Escape one or more asterisks (\*+)
Match a bitcoin address
url
Strip non-digits
Namespace Prefix
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 |
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