The other regex portions in parentheses are the groups for saving the “before” and “after”.the (?i) looks like a group, but isn’t instead, it makes sure that the match ignores case on letters.The groups are often easier to understand: The two ways I know of doing that are saving the “before” and “after” in groups, which can then be referenced in the replacement or I can use the fancy features of look-behind or match-reset for the “before” and lookahead for the “after”. I know that it needs to have something that “goes before”, and something that “goes after”, but I want the “goes before” and “goes after” to stay the same. There are lots of ways to implement that sentence.įirst, I know there is going to be a - in my regex, because that’s the only character I want to really replace. When solving a problem like yours, I try to state the problem in my native language in a way that encapsulates all of my requirements: “to be matched (and later replaced), the - must have the literal $ with one or more letter characters before it and must have one or more letter characters after it, but I only want the - to be replaced”. If you want to match the literal $ character in a regex, you need to escape it: \$. The first problem with your regex is the $ character: in Notepad 's regular expressions, that means “end of line”.
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