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Regular expression

Posted on 2006-07-23
Last Modified: 2010-04-17
How do I do a regular exp which will  contain:

hello in either lower or uppercase
or byebye in either lower or uppercase

both can have any prefix or suffix
Question by:noam_dz
LVL 25

Accepted Solution

InteractiveMind earned 100 total points
ID: 17163088
Like this?

LVL 25

Expert Comment

ID: 17163094
What language are you using however?

Because you could simplify that down to:


And specify case insensitivty to the regex compiler.
LVL 25

Expert Comment

ID: 17163105
Hmm.. Unless you mean that the entire string must be in either lower case or upper case, rather than potentially a mix of both?

In which case, you could do this:

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Assisted Solution

rockiroads earned 100 total points
ID: 17163285
something I picked up in perl earlier




Assisted Solution

owenli27 earned 100 total points
ID: 17165221
In Java:
Pattern ptrnForm = Pattern.compile("([.\\s]*?hello[.\\s]*?)|([.\\s]*?byebye[.\\s]*?)", Pattern.CASE_INSENSITIVE);

In Perl:
if( $str =~ /(hello)|(byebye)/i )

Assisted Solution

by:Anandhi K
Anandhi K earned 100 total points
ID: 17165816
Regex.IsMatch(Value,"(/.*?[hello|byebye]?/.*/i)", RegexOptions.IgnoreCase);

In regular expressions, a period can stand for any character. Using a period in a pattern is a way of requiring that "something" occurs here, without having to decide what. (because both can have any prefix or suffix)

the asterisk ("*") is any number of

question-mark ("?") means occurs exactly once

Advanced -- i - Case-insensitive match

Can avoid /i in case of using RegexOptions.IgnoreCase.
LVL 84

Assisted Solution

ozo earned 100 total points
ID: 17165851
You don't need the () in
if( $str =~ /hello|byebye/i )
unless you also want to capture the match, which you can do with
if( $str =~ /(hello|byebye)/i )
But note that these would also match $str = "phellodendron"


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