Regex Tester
Regex Tester
[abc]- A single character of: a, b, or c
[^abc]- Any single character except: a, b, or c
[a-z]- Any single character in the range a-z
[a-zA-Z]- Any single character in the range a-z or A-Z
^- Start of line
$- End of line
\A- Start of string
\z- End of string
.- Any single character
\s- Any whitespace character
\S- Any non-whitespace character
\d- Any digit
\D- Any non-digit
\w- Any word character (letter, number, underscore)
\W- Any non-word character
\b- Any word boundary
(...)- Capture everything enclosed
(a|b)- a or b
a?- Zero or one of a
a*- Zero or more of a
a+- One or more of a
a{3}- Exactly 3 of a
a{3,}- 3 or more of a
a{3,6}- Between 3 and 6 of a
-
unicode (
u) -
enables Unicode specific patterns like
\pand change modifiers like\w,\W,\sand friends to also match on Unicode. It expects valid Unicode strings to be given on match -
caseless (
i) - adds case insensitivity
-
dotall (
s) -
causes dot to match newlines and also set newline to anycrlf; the new line setting can be overridden by setting (*CR) or (*LF) or (*CRLF) or (*ANY) according to
:re documentation -
multiline (
m) -
causes
^and$to mark the beginning and end of each line; use\Aand\zto match the end or beginning of the string -
extended (
x) -
whitespace characters are ignored except when escaped and allow
#to delimit comments -
firstline (
f) - forces the unanchored pattern to match before or at the first newline, though the matched text may continue over the newline
-
ungreedy (
U) -
inverts the "greediness" of the regexp (the previous
roption is deprecated in favor ofU)
- US Phone Number
-
\(?\d{3}\)?-? *\d{3}-? *-?\d{4} - Unix Epoch Time (named captures)
-
\A(?<sign>-)?(?<seconds>\d{10,11})(?:\.(?<subseconds>\d{1,10}))?\z - Entire string is only numbers
-
\A[0-9]*\z - HTML attribute (eg: class)
-
(?<=class=(?:'|")).*?(?=(?:'|").*?>) - Simple Email Address
-
\A[^\s]+@[^\s]+\z - Only alpha-numeric, underscore, and dash characters
-
\A[\w-]+\z