Regex - All Text Not Containing

Regex - All Text Not Containing

Text that does not contain ~

[^~\x22]+

Match anything except \n

.*

Match strings that do not start with a sequence

Ignore strings that start with the label “abc_”.

Use a negative look-ahead assertion:

^(?!abc_).+

Or, use a negative look-behind assertion:

(^.{1,3}$|^.{4}(?<!abc_).*)

Or, use plain old character sets and alternations:

^([^a]|a($|[^b]|b($|[^c]|c($|[^_])))).*

Match strings that do not end in particular sequence

Use a negative lookbehind assertion:

^[/\w\.-]+(?<!\.html)$

or, use a lookahead:

^(?!.*\.html$)[/\w\.-]+$

or, another use of a lookahead assertion:

/((?!\.html$)[/\w.-])+/

NOTE:

( - Start a group for the purposes of repeating.
(?!\.html$) - Negative lookahead assertion for the pattern /\.html$/.
[/\w.-] - The pattern for matching a URL character.
)+ - Repeat the group.

To force it to match the entire string, anchor the entire pattern with ^ at the start and $ at the end; otherwise it is free to only match a portion of the string. With this change, it becomes:

/^((?!\.html$)[/\w.-])+$/

References

https://www.regular-expressions.info/lookaround.html