Regular expression lookarounds are zero-width assertions that verify conditions about the context of a match at the current match position.
Obviously, you can use the | (pipe?) to represent OR, but is there a way to represent AND as well? Specifically, …
regex lookaheadIn my home directory I have a folder drupal-6.14 that contains the Drupal platform. From this directory I use the …
regex lookahead negative-lookaheadIs it possible to do string negation in regular expressions? I need to match all strings that do not contain …
regex lookahead negative-lookahead negationI have a string foo-bar-bat.bla I wish to match only foo My flawed pattern matches both foo and bar \…
regex lookahead find-occurrencesJust a simple regex I don't know how to write. The regex has to make sure a string matches all 3 …
php javascript regex programming-languages lookaheadI need to validate an input on a form. I'm expecting the input to be a number between 1 to 19 digits. …
regex validation pcre lookahead negative-lookaheadSince I started writing this question, I think I figured out the answers to every question I had, but I …
javascript regex split lookaheadI have trouble understanding how to compute the lookaheads for the LR(1)-items. Lets say that I have this grammar: …
parsing context-free-grammar lookahead dfa lrI've almost got the answer here, but I'm missing something and I hope someone here can help me out. I …
regex lookbehind lookaheadI am implementing the following problem in ruby. Here's the pattern that I want : 1234, 1324, 1432, 1423, 2341 and so on i.e. the …
regex permutation lookahead negative-lookahead