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Readme: clarify that we use the `gawk` ERE syntax, not `grep -E` 

See https://github.com/Morantron/tmux-fingers/issues/96 for an issue caused by the difference between the two syntaxes.
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Ilya Grigoriev 2023-06-16 13:21:48 -07:00 committed by GitHub
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@ -128,12 +128,13 @@ set -g @fingers-pattern-1 'yolo'
set -g @fingers-pattern-50 'whatever'
```
Patterns are case insensitive, and grep's extended syntax ( ERE ) should be used. Patterns
matching the empty string are disallowed.
`man grep` for more info.
Patterns are case insensitive, and
[`gawk`'s syntax for extended regular expressions (EREs)](https://github.com/Morantron/tmux-fingers/issues/96)
should be used (see also `man gawk`). It is very similar to, but slightly
different from, the `grep -E` ERE syntax.
If the introduced regexp contains an error, an error will be shown when
invoking the plugin.
invoking the plugin. Patterns matching the empty string are disallowed.
## @fingers-main-action