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Context free grammar for this language...

Regular expressions...

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Design a language L such that neither L nor its complement has an infinite regular subset?...

Proving that a language is regular by giving a regular expression...

What is the power of regular expressions?...

Quick/Simple Regex/Regular Language Clarification...

What are the theoretical implications of unbounded lookbehind?...

substring match faster with regular expression?...

Scheme, When to use Symbols instead of Strings?...

deriving regular expressions from a regular language...

Is it possible to have regexp that matches all valid regular expressions?...

javascript regular expression select html element with class="product" from string...

any character notation for php regular expression...

Regular expression problem...

regular expression to pull words beginning with @...