C# regular expression

Question

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I try to do a regex in C#. Here is the text

E1A: pop(+)
call T
call E1
E1B: return
TA: call F
call T1

I want to split it like this:

1)
E1A: pop(+)
call T
call E1

2)
E1B: return

3)
TA: call F
call T1

I tought at lookbehind, but it's not working because of the .+

Here is what I hope to work but it doesn't:

"[A-Z0-9]+[:].+(?=([A-Z0-9]+[:]))"

Does anyone have a better ideea?

EDIT: The "E1A","E1B","TA" are changing. All it remains the same is that they are made by letter and numbers follow by ":"

Are "E1A", "E1B", and "TA" constants? Or do these values change, or do they move out of order? You haven't explicitly defined the rules for what you want to capture. — qJake
– qJake, Commented Jan 26, 2012 at 21:26
The "E1A","E1B","TA" are changing. All it remains the same is that they are made by letter and numbers follow by ":" — Gigg
– Gigg, Commented Jan 26, 2012 at 21:29
Are the line breaks consistent? Will you always have "\r\n<sequence of letters/numbers>:<sequence of letters/numbers spanning multiple lines>"? — qJake
– qJake, Commented Jan 26, 2012 at 21:30
In the original text I have line breaks. But I tought it would be easier if I take them out. That's why there is the .+(I replace them with "" before I make the regex).But if you have a solution for the \r\n included, would be great — Gigg
– Gigg, Commented Jan 26, 2012 at 21:32
I can make line breaks appear before every statement with a colon, but you can't do incrementing counters in Regex. Do you want it to count, or do you want it to just insert line breaks? — qJake
– qJake, Commented Jan 26, 2012 at 21:37

Tim Pietzcker · Accepted Answer · 2012-01-26 21:34:18Z

3

Regex regexObj = new Regex(
    @"^               # Start of line
    [A-Z0-9]+:        # Match identifier
    (?:               # Match...
     (?!^[A-Z0-9]+:)  #  (unless it's the start of the next identifier)
     .                #  ... any character,
    )*                #  repeat as needed.", 
    RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
allMatchResults = regexObj.Matches(subjectString);

Now allMatchResults.Count will contain the number of matches in subjectString, and allMatchResults.Item[i] will contain the ith match.

answered Jan 26, 2012 at 21:34

Tim Pietzcker

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2 Comments

Gigg Over a year ago

it's working. Could you explain what it means? I mean I know that (?:...) matches the regex, but it's not returnd, but the rest? Thank you so much

Gigg Over a year ago

:)) :)) exactly what I asked for. Thank's

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