Regex
Estimated reading time: 2 minutesregex tips
| short | description |
|---|---|
^ |
start |
$ |
end |
pipe |
or / alternate |
* |
0 or more |
+ |
1 or more |
\ |
escape specialess |
? |
0 or one |
{3} |
exact 3 |
{3,} |
3 or more |
{3,5} |
3,4 or 5 |
() |
group |
[] |
set |
[^abc] |
not abc |
[abc] |
a.b or c |
[A-Z] |
uppercase A to Z |
[a-z] |
lowercase a to z |
[a-zA-Z] |
lowercase and uppercase a to z |
[0-9] |
0 to 9 |
- NB:
pipe=|
basic 2 regex
| short | description |
|---|---|
\n |
newline |
\t |
tab |
\r |
Carriage return |
\f |
Form feed |
character set table
| short | description |
|---|---|
\w |
alphanumeric [a-zA-Z0-9_] |
\W |
non alphanumeric [a-zA-Z0-9_] . [\W] = [^\w] |
\d |
digit [0-9] |
\D |
non digit [0-9] |
\s |
whitespace [\t\n\f\r\p{Z}] |
\S |
non whitespace |
flag
| short | description |
|---|---|
| g | global |
| m | multi-line |
| i | case insensitive |