Regex .net multiple line

user_310995 0
Viewed 51

I have these examples:

{I18n.get("Testing 123...")}

{I18n.get('Testing 123...')}

    {I18n.get(
            "Testing 123..."
     )}
    
    {I18n.get("Testing 123..."
     )}
    
    {I18n.get(
            "Testing 123...")}

I want to extract the 'Testing 123...' in .Net using C# Regex. What I did was:

        Regex r = new Regex(@"(?:I18n.get\(""(.+?)""\))", RegexOptions.IgnoreCase | RegexOptions.Singleline);

        var matches = r.Matches(txt)
                        .Select(xx=> xx.Groups)
                        .Select(xx=> xx.Last().Value)
                        .ToList();

When is single line works perfect, but when is multiple line it fails...

And how would be possible to match in a single Regex when the txt is with double quotes " or when is with single quotes ' ?

regex c#
2 Answers

You may use

var r = new Regex(@"I18n\.get\(\s*(""|')(.*?)\1\s*\)", RegexOptions.IgnoreCase | RegexOptions.Singleline);
var results = r.Matches(txt).Cast<Match>().Select(x => x.Groups[2].Value).ToList();

See the regex demo.

Details

  • I18n\.get\( - a literal I18n.get( text
  • \s* - 0+ whitespaces
  • ("|') - Group 1: " or '
  • (.*?) - Group 2: any char, 0 or more occurrences, as few as possible
  • \1 - same value as captured in Group 1
  • \s* - 0+ whitespaces
  • \) - a ) char.
user_38329700

I contend it doesn't matter which open/close quotes should be in the regex when you don't intend to actually parse it as a quoted string, right ?
I mean with all the embed escapes etc...

Use what you know as the delimiters, the text literals
I18n.get( stuff here )

You could use a sub validation that there's an inner quote, but since you're
not parsing quotes, it's not going to be strictly valid anyway.
Here, we just use it to trim so it's not matched and be part of element.

Here it is, the whole match is the value you're looking for, toss it into an array.

@"(?s)(?<=I18n\s*\.\s*get\s*\(\s*['""]\s*).*?(?=\s*['""]\s*\))"

Admin1
Related