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Problem: Cannot find a consistent way to replace a random string between quotes with a specific string I want. Any help would be greatly appreciated. Example: String str1 = "test=\"-1\""; should become String str2 = "test=\"31\""; but also work for String str3 = "test=\"foobar\""; basically I want to turn this String str4 = "test=\"antyhingCanGoHere\""; into this String str4 = "test=\"31\""; Have tried: Case insensitive Regex without using RegexOptions enumeration How do you do case-insensitive string replacement using regular expressions? Replace any character in between AnyText: and <usernameredacted@example.com> with an empty string using Regex? Replace string in between occurrences Replace a String between two Strings Current code: Regex RemoveName = new Regex("(?VARIABLE=\").*(?=\")", RegexOptions.IgnoreCase); String convertSeccons = RemoveName.Replace(ruleFixed, "31"); Returns error: System.ArgumentException was caught Message=parsing "(?VARIABLE=").*(?=")" - Unrecognized grouping construct. Source=System

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