1 Meith 2017 · Specifically when does ^ mean "match start" and when does it mean "not the following" in regular expressions? From the Wikipedia article and other references, I've …

What are ^.* and .*$ in regular expressions? Asked 13 years, 11 months ago Modified 2 years, 5 months ago Viewed 231k times

What's the difference between () and [] in regular expression patterns? Asked 15 years, 1 month ago Modified 2 years, 8 months ago Viewed 145k times

A regular expression can only act as a rudimentary filter. The problem with regular expressions is that telling someone that their perfectly valid e-mail address is invalid (a false negative) …

On greedy vs non-greedy Repetition in regex by default is greedy: they try to match as many reps as possible, and when this doesn't work and they have to backtrack, they try to match one fewer …

15 DFómh 2009 · May I know what ?= means in a regular expression? For example, what is its significance in this expression: (?=.*\\d).

The order is always implied in the structure of the regular expression. To accomplish what you want, you'll have to match the input string multiple times against different expressions.

13 Aib 2013 · For example, ab|de would match either side of the expression. However, for something like your case you might want to use the ? quantifier, which will match the previous …

This allows for the .NET regular expression engine to recognize a subset of the context-free languages, in particular the ones that only require a simple counter. This in turn allows for the …

Syntax for Regular Expressions To create a regular expression, you must use specific syntax—that is, special characters and construction rules. For example, the following is a simple regular …