Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
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  • Python 2.7
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/
^P|!.3|w\^|^[^C\\|]$|\.[)$-](?!.!)
/
gm
1st Alternative
^P
^ asserts position at start of a line
P matches the character P literally (case sensitive)
2nd Alternative
!.3
! matches the character ! literally (case sensitive)
. matches any character (except for line terminators)
3 matches the character 3 literally (case sensitive)
3rd Alternative
w\^
w matches the character w literally (case sensitive)
\^ matches the character ^ literally (case sensitive)
4th Alternative
^[^C\\|]$
^ asserts position at start of a line
Match a single character not present in the list below
[^C\\|]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
C matches the character C literally (case sensitive)
\\ matches the character \ literally (case sensitive)
| matches the character | literally (case sensitive)
$ asserts position at the end of a line
5th Alternative
\.[)$-](?!.!)
\. matches the character . literally (case sensitive)
Match a single character present in the list below
[)$-]
)$- matches a single character in the list )$- (case sensitive)
Negative Lookahead
(?!.!)
Assert that the Regex below does not match
. matches any character (except for line terminators)
! matches the character ! literally (case sensitive)
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.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String