`^` and `$` bind more tightly than `|`.
you want
```
^(s|(e?h?))$
```
On 10 Feb 2020, at 16:58, Tom Robinson wrote:
What have I missed here guys?
I want to match entire lines which are empty, contain a single
’s’, or contain ‘e’ and/or ‘h’ (in that order):
e
h
eh
s
ehs
he
x
The first 5 lines should match (including the empty line), last 3
shouldn’t.
But despite the caret anchor, my pattern is catching the ending of
unwanted lines:
^s|(e?h?)$
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