pcre - Regex pattern to match string that's not followed by a colon

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Using regex, I'm trying to match any
string of characters that meets the following conditions (in the order
displayed):

• Contains
  a dollar sign $; then


• at least
  one letter [a-zA-Z]; then


• zero
  or more letters, numbers, underscores, periods (dots), opening brackets, and/or closing
  brackets [a-zA-Z0-9_.\[\]]*;
  then


• one pipe character |;
  then


• one at sign @;
  then


• at least one letter
  [a-zA-Z]; then


• zero or more
  letters, numbers, and/or underscores [a-zA-Z0-9_]*;
  then


• zero colons
  :

In
other words, if a colon is found at the end of the string, then it should
not count as a
match.

Here are some examples of valid
matches:

$tmp1|@hello
$x2.h|@hi_th3re
Valid
            match$here|@in_the middle of other
            characters

And
here are some examples of invalid
matches:

$tmp2|@not_a_match:"because
            there is a
            colon"
$c.4a|@also_no_match:

Here
are some of the patterns I've
tried:

(\$[a-zA-Z])([a-zA-Z0-9_.\[\]]*)(\|@)([a-zA-Z][a-zA-Z0-9_]*(?!.[:]))
(\$[a-zA-Z])([a-zA-Z0-9_.\[\]]+)?(\|@)([a-zA-Z][a-zA-Z0-9_]*(?![:]))

(\$[a-zA-Z])([a-zA-Z0-9_.\[\]]+)?(\|@)([a-zA-Z][a-zA-Z0-9_]*)([^:])

Answer

This pattern will do what you
need

\$[A-Za-z]+[\w.\[\]]*[|]@[A-Za-z]+[\w]*+(?!:)

href="https://regex101.com/r/fX2uY2/4" rel="nofollow">Regex
Demo

I am
using possessive quantifiers to cut down the backtracking using
[\w]*+. You can also use atomic groups instead of possessive
quantifiers
like

\$[A-Za-z]+[\w.\[\]]*[|]@[A-Za-z]+(?>[\w]*)(?!:)

NOTE

\w =>
[A-Za-z0-9_]