Regex replace IF a variable does not match a string

Question

I am trying to create a regexp with replace for use in a java embedded application that will pass a URL through an on click. What I have so far is

(bi.)(.*\.)([^.]+)(.com)$ with replace set to $2$3$4

This, however, does not allow for passing to environments without the second variable. What I need is something that will say IF .*\. is prd001 THEN '' ELSE .*\. I need to negate the prd001 where it exists, but pass that portion through if it is anything else in the substitution portion.

I am very new to these concepts and if you ask what language this is for, I probably could not tell you other than our application is written in JAVA. I do know I will need escape characters later, and am confident in that portion. Just lost with the regex. Thank you for any help you can provide

Peter Alfvin · Accepted Answer · 2013-12-07 20:50:13Z

1

Assuming I understand your request and your original regex is correct (I thought you might have meant bi\. in the initial capture group), the following should work:

(bi.)(?:(?:prd001\.)|(.*\.))([^.]+)(.com)

as shown in http://rubular.com/r/oU1ls2Gy6x and http://rubular.com/r/YDhYObKe1c

The ?: construct tells the regex machinery to match the following expression but not create a capture group. So the second capture group will be empty if any only if prod001. is not present there.

edited Dec 7, 2013 at 20:50

answered Dec 7, 2013 at 19:01

Peter Alfvin

29.6k9 gold badges72 silver badges114 bronze badges

Sign up to request clarification or add additional context in comments.

9 Comments

Bohemian Over a year ago

Your rubular link only has one example url. Add an example for a non prod url, and maybe other edge cases

Peter Alfvin Over a year ago

@Bohemian Do you know how to do that (include multiple test strings) within a single Rubular?

Peter Alfvin Over a year ago

@Bohemian I added a non-prod test string, but given the ambiguities in the question, I'm not sure what edge cases to include.

whit.the.engineer Over a year ago

Thank you for the answer. I am testing this in notepad++ but it is not exluding 'prd001.' The examples I am working with are: What is input > What I need bi.bidev-30000.123.com > bidev-30000.123.com, bi.prd001.123.com > 123.com, bi.test30000.123.com > test30000.123.com

Peter Alfvin Over a year ago

Was it just the prd001 example that didn't work? They all work for me in Sublime 2. Is Notepad a reference to Windows' Notepad?

|

skiwi · Accepted Answer · 2013-12-07 19:01:14Z

0

Try to change the regex to (bi.)(.*\.)?([^.]+)(.com)$

Now it will only use the (.*\.) if it is present, and thus if not present the $2 will be empty.

answered Dec 7, 2013 at 19:01

skiwi

69.8k32 gold badges140 silver badges225 bronze badges

1 Comment

whit.the.engineer Over a year ago

I did end up incorporating the question mark in order to be sure to gather examples such as bi.123.com. Thanks for this, it was a great help, but alone it was not the answer.

Collectives™ on Stack Overflow

Regex replace IF a variable does not match a string

2 Answers 2

9 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

9 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related