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I want a single regex that when applied to : "firstsecondthird" will match "firstthird" (in single group, ie in C# Match.Value will be equal to "firstthird").
Is that possible? we can ignore suffix or prefix , but middle?
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To match a literal space, you'll need to escape it: "\\ " . This is a useful way of describing complex regular expressions: phone <- regex(" \\(? #
End of String or Before Ending Newline: \Z The \Z anchor specifies that a match must occur at the end of the input string, or before \n at the end of the input string. It is identical to the $ anchor, except that \Z ignores the RegexOptions. Multiline option.
capturing in regexps means indicating that you're interested not only in matching (which is finding strings of characters that match your regular expression), but you're also interested in using specific parts of the matched string later on.
The caret ^ and dollar $ characters have special meaning in a regexp. They are called “anchors”. The caret ^ matches at the beginning of the text, and the dollar $ – at the end. The pattern ^Mary means: “string start and then Mary”.
match a string that starts with 'first', has zero or more other characters, then ends with 'third'. Is that what you mean?
"^first(.*)third$"
Or, do you mean if you find a string 'firstsecondthird', ditch everything apart from 'first' and 'third'?
replace("^(first)second(third)$", "$1$2")
No, there is no facility to make a single match group containing non-contiguous text from the target string. You will need to use replace, or glue together the matching groups into a new string.
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AFAIK, it is not possible to do with a single regular expression. You will have to use a call to replace(); as follows:
String inputVar = "firstsecondthird";
String resultVar = Regex.replace(inputVar, "^(first)second(third)$", "$1$2");
which can (typically...) be inserted into an expression as necessary
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