Regular Expressions 101

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/
\[authis\](.*?)(\[else\](.*?))?\[\/authis\]
/
sig
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case insensitive)
authis
matches the characters authis literally (case insensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case insensitive)
1st Capturing Group
(.*?)
.
matches any character
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
2nd Capturing Group
(\[else\](.*?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case insensitive)
else
matches the characters else literally (case insensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case insensitive)
3rd Capturing Group
(.*?)
.
matches any character
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case insensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case insensitive)
authis
matches the characters authis literally (case insensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case insensitive)
Global pattern flags
s modifier: single line. Dot matches newline characters
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
sig

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