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There are examples of this in the Wireshark User's Guide:

http.host matches "acme\\.(org|com|net)"
The display filter above matches HTTP packets where the HOST header contains acme.org, acme.com, or acme.net. Comparisons are case-insensitive.

WSUG: 6.4.2. Comparing Values
"Another common pitfall is using . instead of \. in a regular expression. The former will match any character (the backslash is superfluous) while the latter will match a literal dot."

Try: ip.host matches "^10\\."

There are examples of this in the Wireshark User's Guide:

http.host matches "acme\\.(org|com|net)"
The display filter above matches HTTP packets where the HOST header contains acme.org, acme.com, or acme.net. Comparisons are case-insensitive.

WSUG: 6.4.2. Comparing Values
"Another common pitfall is using . instead of \. in a regular expression. The former will match any character (the backslash is superfluous) while the latter will match a literal dot."

Try: ip.host matches "^10\\."

(xkcd 1638: Backslashes)