1.7 KiB
1.7 KiB
Regular expression
Read Syntax.
Read Golang-Regex-Tutorial.
Play with Regex101.
Basic
| regex | meaning |
|---|---|
. |
any character, default not including \n |
[xy] |
x or y character |
[^xy] |
not x and y character |
x|y |
x or y |
x* |
0 or more x, prefer more |
x+ |
1 or more x, prefer more |
x? |
0 or 1 x , prefer 1 |
x*? |
0 or more x, prefer fewer |
x+? |
1 or more x, prefer fewer |
^ |
at beginning of text |
$ |
at end of text |
\d |
digits |
\D |
not digits |
\s |
whitespace |
\S |
not whitespace |
(foo) |
numbered capturing group (submatch) |
(?:foo) |
non capturing group |
(?:x|y) |
x or y expression wrap in () |
(?flags) |
set flags within current group |
| flag | meaning |
|---|---|
i |
case-insensitive |
s |
. match \n |
Example
(?i)hello\sfoo
match: Hello Foo
match: heLLo fOO
hello\s(.+)
match: hello foo
group 1: foo
match: hello bar
group 1: bar