Regular Expressions 101

Save & Share

  • Save Regex
    ctrl+s
  • Update Regex
    ctrl+⇧+s

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8

Function

  • Match
  • Substitution
  • List
  • Unit Tests
"
\?[^w$]*\$$|^P|\w.\)|w.?\+|w\^|[^?P]P$
"
gm
1st Alternative
\?[^w$]*\$$
\? matches the character ? with index 6310 (3F16 or 778) literally (case sensitive)
Match a single character not present in the list below
[^w$]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
w$
matches a single character in the list w$ (case sensitive)
\$ matches the character $ with index 3610 (2416 or 448) literally (case sensitive)
$ asserts position at the end of a line
2nd Alternative
^P
^ asserts position at start of a line
P matches the character P with index 8010 (5016 or 1208) literally (case sensitive)
3rd Alternative
\w.\)
\w matches any word character (equivalent to [a-zA-Z0-9_])
. matches any character (except for line terminators)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
4th Alternative
w.?\+
w matches the character w with index 11910 (7716 or 1678) literally (case sensitive)
.
matches any character (except for line terminators)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
\+ matches the character + with index 4310 (2B16 or 538) literally (case sensitive)
5th Alternative
w\^
w matches the character w with index 11910 (7716 or 1678) literally (case sensitive)
\^ matches the character ^ with index 9410 (5E16 or 1368) literally (case sensitive)
6th Alternative
[^?P]P$
Match a single character not present in the list below
[^?P]
?P
matches a single character in the list ?P (case sensitive)
P matches the character P with index 8010 (5016 or 1208) literally (case sensitive)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
gm

Test String