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v1.00
TasmotaManager/regex_dot_explanation.md
Mike Geppert 126cd39555 Major code improvements and bug fixes: 
1. Restructured configuration: Moved config_other and console to top level
2. Added common _match_pattern function for regex pattern matching
3. Implemented Unifi Hostname bug fix in is_hostname_unknown
4. Created common get_device_hostname function to eliminate code duplication
5. Added comprehensive test scripts for all new functionality
6. Added detailed documentation for all changes
2025-08-08 19:04:33 -05:00

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Explanation of "." in Regex Patterns

In the exclude_patterns section of the network_configuration.json file, you have patterns like:

"^.*sonos.*"

What does the "." do in regex?

In regular expressions (regex):

  • The "." (dot) matches any single character except a newline character
  • It's different from "*" which is a quantifier meaning "zero or more of the preceding element"

Breaking down the pattern "^.sonos.":

  • ^ anchors to the beginning of the string
  • .* means "zero or more of any character"
  • sonos matches the literal string "sonos"
  • .* again means "zero or more of any character"

This pattern matches any string that starts with any characters (or none), contains "sonos", and may have any characters after it.

Examples of matching strings:

  • "sonos"
  • "sonosdevice"
  • "mysonosspeaker"
  • "new-sonos-system"