[regex] Regular expression for a string that does not start with a sequence

I'm processing a bunch of tables using this program, but I need to ignore ones that start with the label "tbd_". So far I have something like [^tbd_] but that simply not match those characters.

This question is related to regex

The answer is

You could use a negative look-ahead assertion:

^(?!tbd_).+

Or a negative look-behind assertion:

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

Or just plain old character sets and alternations:

^([^t]|t($|[^b]|b($|[^d]|d($|[^_])))).*

Source: Stackoverflow.com

Examples related to regex

• Why my regexp for hyphenated words doesn't work? • grep's at sign caught as whitespace • Preg_match backtrack error • regex match any single character (one character only) • re.sub erroring with "Expected string or bytes-like object" • Only numbers. Input number in React • Visual Studio Code Search and Replace with Regular Expressions • Strip / trim all strings of a dataframe • return string with first match Regex • How to capture multiple repeated groups?

[regex] Regular expression for a string that does not start with a sequence

The answer is

Examples related to regex

Tags