Conditional Regular Expression in java

Question

I have to develop a program that validates input from the user. String format is:

ebill (ao|aio|block) [email protected](any email address)

Now i'm looking for a solution with the following conditions:

ebill ao or ebill aio checks for third argument which is an email address.
but if i got ebill block then my regular expression wouldn't check for email address.

morja · Accepted Answer · 2011-05-27 09:16:58Z

3

I would do it this way:

ebill (((ao|aio) [email protected])|block)

answered May 27, 2011 at 9:16

morja

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Denis de Bernardy · Accepted Answer · 2011-05-27 09:15:08Z

2

The short answer is don't. Parse the list of arguments by splitting your string on spaces, and act upon each one as needed.

answered May 27, 2011 at 9:15

Denis de Bernardy

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1 Comment

AlexR Over a year ago

I disagree with you. Regular expression engine is very optimized and fast. Splitting string to chunks by spaces is not more effective than running precompiled regular expression against this string. Moreover String.split() uses regular expressions anyway.

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