Question

I’m trying to match different abbreviations for the german word “Straße” (e.g. “Str” or “Str.”)

How can i escape the dot sign within the string?

\b(Str|Str.)\b

And how can i setup case-insensitive? It would be nice if the regex matches “str”, “sTr”, … too.

Answer 1

You escape special characters with \.

\b(Str|Str\.)\b

Also, ? makes the preceding token optional, so we can condense to:

\b(Str\.?)\b

Finally, case insensitivity is specified with the i modifier. How you specify modifiers depends on the language. In most cases they’re put after the closing delimiter of the regex:

/\b(str\.?)\b/i