Validate ?
Validate .
Common metacharacters
Code | Description |
---|---|
. | Matches any character except newline |
\w | Match letters or numbers or underscores |
\s | Matches any whitespace |
\d | Matching numbers |
\b | Match the beginning or end of a word |
^ | Match the beginning of a string |
$ | Match end of string |
Common qualifiers
Code / syntax | Description |
---|---|
* | Repeat zero or more times |
+ | Repeat one or more times |
? | Repeat zero or one time |
{n} | Repeat n times |
{n,} | Repeat n or more times |
{n,m} | Repeat n to m times |
Common antonyms
Code / syntax | Description |
---|---|
\W | Matches any characters that are not letters, numbers, underscores, or Chinese characters |
\S | Matches any character that is not a space character |
\D | Matches any non-digit character |
\B | Matches where the word is not beginning or ending |
[^x] | Matches any character except x |
[^aeiou] | Matches any character except the letters aeiou |