C# Regular Expressions Replace

Question

I'm trying to rewrite some text that contains URLs such as:

"/route/id"
"/base/route/id"
"/route2/id"
"/base/route2/id"

of which there will be many in the text. The quotes are part of the text being matched.

All these URLs need to be of the format "/base/..." so I need to rewrite "/ to "/base/ unless the "/base is already there. Which is the bit I'm struggling with. I can replace the "/ but not when it's already followed by base.

Give us some proper samples and we can help you write something that handles an actual piece of data. — Simon Whitehead
– Simon Whitehead, Commented Jul 11, 2013 at 10:39
Do you want the preserve the format of the file? And can there be more than one URL per line? — David Colwell
– David Colwell, Commented Jul 11, 2013 at 11:01

dav_i · Accepted Answer · 2013-07-11 10:50:01Z

2

No need for Regex:

var listOfThingsAllWithBase = listOfThings.Select(a => a.StartsWith("\"/base") ? a : "\"/base" + a.Substring(1, a.Length - 2));

edited Jul 11, 2013 at 10:50

answered Jul 11, 2013 at 10:35

dav_i

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5 Comments

Chris Sinclair Over a year ago

Note that this will not handle the existing quotation mark. e.g., "/route/id" will become "/base"/route/id". But a little bit more string manipulation will handle it just fine.

sq33G Over a year ago

automatic +1 for any correct non-regex answer to a regex question

big_tommy_7bb Over a year ago

Thanks dav_i. Maybe I was wasn't clear but this is just one text string and there could be multiple instances on one line. So it's not a list of things.

Chris Sinclair Over a year ago

@tim_barber_7BB: You should update your question with that requirement and some full sample lines then.

dav_i Over a year ago

@tim_barber_7BB Please update your question with your exact requirements. How will the multiple instances be shown on one line? Is there any more text? This meets what is stated in your question as it stands.

Sidheag · Accepted Answer · 2013-07-11 10:39:34Z

0

My regex is a little rusty, but if I remember correctly, this should find all entries not starting with /base ^(?!/base)

answered Jul 11, 2013 at 10:39

Sidheag

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