how to replace group value using regex in c# .net

Question

I have a string like

string s= "I WAS born in AMERICA on december 1978.";

Now I want to convert december to December using regex

I have used below incomplete regex

s=Regex.Replace(s,(january|february|march|April|may|june|july|august|september|October|november|December),CultreInfo.InvariantCulture.TextInfo.ToTitleCase(?????),RegexOption.IgnoreCase);

What I have to write here (?????) so that I can get below output

s= "I WAS born in AMERICA on December 1978.";

Is there any other way which I can apply??

hjpotter92 · Accepted Answer · 2016-02-19 06:24:48Z

2

Looking at regex.replace documentation, I notice that you'd have to use a callback function.

So write a function:

function CustomReplace( Match m ) {
    return CultreInfo.InvariantCulture.TextInfo.ToTitleCase(m.Groups[1].Value)
}

and pass it as the 3rd argument:

s = Regex.Replace(
    s,
    "(january|february|march|April|may|june|july|august|september|October|november|December)",
    CustomReplace,
    RegexOption.IgnoreCase
);

answered Feb 19, 2016 at 6:24

hjpotter92

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goTo-devNull · Accepted Answer · 2016-02-19 07:26:00Z

0

Using a named capture and inline MatchEvaluator:

string s = "I WAS born in AMERICA on december 1978.";
s = Regex.Replace(
    s,
    "(?<months>january|february|march|April|may|june|july|august|september|October|november|December)",
    new MatchEvaluator(
        match => CultureInfo
                .InvariantCulture
                .TextInfo
                .ToTitleCase(match.Groups["months"].Value)
    ),
    RegexOptions.IgnoreCase
);

answered Feb 19, 2016 at 7:26

goTo-devNull

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