Regular Expressions 101

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/
([^\\}<]{3}|][^]]|^).?[$PG]$
/
gm
1st Capturing Group
([^\\}<]{3}|][^]]|^)
1st Alternative
[^\\}<]{3}
Match a single character not present in the list below
[^\\}<]
{3} matches the previous token exactly 3 times
\\ matches the character \ with index 9210 (5C16 or 1348) literally (case sensitive)
}<
matches a single character in the list }< (case sensitive)
2nd Alternative
][^]]
] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
Match a single character not present in the list below
[^]]
] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
3rd Alternative
^
^ asserts position at start of a line
.
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)
Match a single character present in the list below
[$PG]
$PG
matches a single character in the list $PG (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.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String

Code Generator

Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php