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Regex Expression in VBA

Posted on 2015-01-11
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Last Modified: 2015-01-11
"(http://)?([\w-]+\.)([\w-]+\.)?([\w-]+)([:/].*)?"

To verify my understanding, the submatch is
1. (http://)?
2. ([\w-]+\.)
3. ([\w-]+\.)?
4. ([\w-]+)
5. ([:/].*)?

The division of "?" is following the matching expression in each portion, correct ?

For the 5th submatch : ([:/].*)?, "?" mean zero or more for the expression within (). but what does ".*" mean ? Tks


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Question by:AXISHK
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Expert Comment

by:ozo
ID: 40543621
The ? in (http://)? makes the match of http:// optional
The ? in ([\w-]+\.)? makes the match of [\w-]+\. optional
The ? in ([:/].*)? makes the match of [:/].* optional
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Assisted Solution

by:Michael74
Michael74 earned 250 total points
ID: 40543622
The question mark tells the regex to match 0 or 1 of the preceding pattern

so

(http://)?  allows for the pattern "http://" to be present or missing
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Author Comment

by:AXISHK
ID: 40543623
Tks

([:/].*)?  -

For ".*" ,  what does it actually mean ?
.            Matches any single character except a new line character
*            Matches preceding element zero or more times
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by:Michael74
ID: 40543626
This matches any string which does not contain a new line. As it is zero or more times it will also match empty strings
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ozo earned 250 total points
ID: 40543627
.* matches any number of non-new line characters
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by:AXISHK
ID: 40543633
Tks
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