Regular Expressions 101

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PCRE2 (PHP >=7.3)
PCRE (PHP <7.3)
ECMAScript (JavaScript)
Python 2.7
Golang
Java 8

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([\s\S])<preview>([\s\S])

1st Capturing Group

([\s\S])

Match a single character present in the list below

[\s\S]

* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

\s matches any whitespace character (equivalent to [\r\n\t\f\v ])

\S matches any non-whitespace character (equivalent to [^\r\n\t\f\v ])

<preview> matches the characters <preview> literally (case sensitive)

2nd Capturing Group

([\s\S])

Match a single character present in the list below

[\s\S]

* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

\s matches any whitespace character (equivalent to [\r\n\t\f\v ])

\S matches any non-whitespace character (equivalent to [^\r\n\t\f\v ])

Global pattern flags

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 Expressions 101

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Regular Expression
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Regular Expressions 101

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Regular Expressionv1Select Regex VersionNo Match

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Regular Expressions 101

Regular Expression
No Match