Regular Expressions 101

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/
(.)\s<preview>\s(.)
/
1st Capturing Group
(.)
.
matches any character (except for line terminators)
* 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 ])
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
<preview> matches the characters <preview> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
2nd Capturing Group
(.)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String

Substitution

Processing...