Pattern alternation on entire line

[Tom Robinson]

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?)$

[Sam Hathaway]

^ and $ bind more tightly than |.

you want

^(s|(e?h?))$

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[Jean-Christophe Helary]

Tom,

The results are

[e]
[h]
[eh]
[s]
[]
ehs
h[e]
x
[]

So, it looks like the regex works like this:

^s

or

(e?h?)$

This one: ^s$|^(e?h?)$ seems to do what you want.


Jean-Christophe Helary
-----------------------------------------------
http://mac4translators.blogspot.com @brandelune

[Tom Robinson]

Ah, thanks Sam!  (and Jean-Christophe)