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Regex - match words that follow the rule i before e except after c Hi I'm wondering how to match words that follow the spelling rule “i before e except after c” (such as brief, receipt, receive, pier) But shouldn't match words that don't follow that rule such as science What I have here is incorrect (as science shouldn't match) but it's what I got so far: enter link description here
What is a regular expression (regex) for matching words that DO NOT . . . The lookbehind version finds the same things, but instead by looking for "ie"s not preceded by a c You can look at your problem as "words matching the rule 'e before i, except after c'", and then it's obvious that you can take your "i before e" solution and just flip the i's and e's, which is basically exactly what I did
I before E, except after C - Code Golf Stack Exchange You may be aware of the famous old rhyme, quot;I before E, except after C quot; It is a rule taught to aid in the spelling of certain English words Quoting Wikipedia: If one is not sure whether a
Why are there exceptions for the i before e except after c rule? The correct rule should apparently be (from the first link), Use I before E Except when C is followed by L, P, T or V Or when sounded like "A" as in weight or "I" as in height Or when a prefix or suffix implies E-I (Note that this means I before E after C the rest of the time!) Note that there are still exceptions to the correct form of
Regular expression: Match everything after a particular word You can add \ pattern after ( *) to make the regex engine stop before the last on that line: test\s*:\s*( *)\ Watch out for re match() since it will only look for a match at the beginning of the string (Avinash aleady pointed that out, but it is a very important note!) See the regex demo and a sample Python code snippet:
Regex - how to match everything except a particular pattern But if you happen not to have a regular expression implementation with this feature (see Comparison of Regular Expression Flavors), you probably have to build a regular expression with the basic features on your own A compatible regular expression with basic syntax only would be: [0-8]\d\d|\d[0-8]\d|\d\d[0-8]
Regex that accepts only numbers (0-9) and NO characters By putting ^ at the beginning of your regex and $ at the end, you ensure that no other characters are allowed before or after your regex For example, the regex [0-9] matches the strings "9" as well as "A9B", but the regex ^[0-9]$ only matches "9"