tommcdo opened a new issue, #723:
URL: https://github.com/apache/lucenenet/issues/723
Part of my code is building a Lucene query to find a user by email. It looks
roughly like this:
```csharp
string query = $"email: {QueryParserBase.Escape(emailAddress)}";
```
There was a case where the email address contained an `=` sign (e.g.
`[email protected]`). With that input, my query resulted in a Syntax Error:
> `Error! Invalid query: Syntax Error, cannot parse email:
[email protected]:`
After some testing, I found that I could fix it in two ways:
1. Wrapping the email address in double quotes
2. Escaping the equals sign, `\=`
Upon further digging, I found that [`QueryParserBase.Escape` does not escape
`=`
signs](https://github.com/apache/lucenenet/blob/master/src/Lucene.Net.QueryParser/Classic/QueryParserBase.cs#L1072-L1074).
Is there a reason `=` is omitted from that function?
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