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Looking for a bit of regex help. I'd like to design an expression that matches a string with "foo" OR "bar", but not both "foo" AND "bar"
If I do something like...
/((foo)|(bar))/ It'll match "foobar". Not what I'm looking for. So, how can I make regex match only when one term or the other is present?
Thanks!
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The ?! n quantifier matches any string that is not followed by a specific string n.
This answer is not useful. Show activity on this post. [] denotes a character class. () denotes a capturing group. [a-z0-9] -- One character that is in the range of a-z OR 0-9.
Alternation is the term in regular expression that is actually a simple “OR”. In a regular expression it is denoted with a vertical line character | . For instance, we need to find programming languages: HTML, PHP, Java or JavaScript.
This is what I use:
/^(foo|bar){1}$/ See: http://www.regular-expressions.info/quickstart.html under repetition
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