java string split with regular expression

Posted on 2015-02-06
Last Modified: 2015-02-06
Hi Experts,

Can someone give me a regular expression that would allow me to:

turn this:  ".exe; .bat, .ui.xml."

into this:    "exe bat ui.xml"

In other words, I want to remove leading and trailing '.' characters and the delimiters are commas, spaces and semi-colons....

Thanks a lot!
Question by:thready
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LVL 35

Expert Comment

by:Dan Craciun
ID: 40593843
String resultString = subjectString.replaceAll("[.;,] [.;,]|^[.;,]|[.;,]$", " ");

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Then simply delete the spaces at the beginning and end.

LVL 86

Expert Comment

ID: 40593857
into this:    "exe bat ui.xml"
That doesn't look right. The last file extension type is joined to something else

Author Comment

ID: 40594031
That's intentional.  There are files that have double extensions - like .ui.xml files.
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Author Comment

ID: 40594048
Thanks Dan!  That's really close - but it didn't work for this one: "..exe;., .bat, .ui.xml" - which I think is still a valid extension list...  I need to be picky here, sorry.  I'm trying to understand your regex...
LVL 35

Accepted Solution

Dan Craciun earned 500 total points
ID: 40594205
String resultString = subjectString.replaceAll("(?m)^[.;,]+|[.;,]+ [.;,]+|[.;,]+$", " ");

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You did not specify on the OP that there can be multiple consecutive .,;

The pattern is quite simple:
1. search for some .;, at the beginning of the string
or (| means OR)
2. search for some ,;. plus space plus some ,;. inside the string
3. search for some .;, at the end of the string.

If found, replace with a single space.

Author Closing Comment

ID: 40594398
Very awesome.  Thanks a lot!
LVL 35

Expert Comment

by:Dan Craciun
ID: 40594403
You're welcome.
Glad I could help!
LVL 35

Expert Comment

by:Dan Craciun
ID: 40594416
Update: if you use this
String resultString = subjectString.replaceAll("(?m)^[.;,]+|[.;,]* [.;,]*|[.;,]+$", " ");

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it will also work for
.bat. ui.xml..
.bat .ui.xml..

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