What does regular expression actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

Many tools use regular expressions and the core syntax is the same. The source of confusion is that the details beyond core syntax have variations.

Regular Expressions (aka Regex) are simply a way of describing what a stream of text should look like. So when you feed G rep a bit of R egular E xpression, it P rints only the text that matches ...

A regular expression is some sequence of characters that represents a pattern. For example, the [0-9] in the example above will match any single digit where [A-Z] would match any capital letter.

Regular expressions come in handy for all varieties of text processing, but are often misunderstood--even by veteran developers. Here's a look at intermediate-level regular expressions and what ...

Basic UNIX Regular Expressions The reflector can search for names using a key that is a UNIX basic regular expression. The PUIDNETD_DATA_RE ('r') field value gives the regular expression and some ...

Regular expressions amplify the power of traditional search-and-replace commands by letting you search for patterns of text and then selectively modify what you’ve found.

A quick run down on how you can use regular expressions in your own programs to give you more power over searching and substituting text.

That expression matches an opening angle bracket, followed by one or more characters that aren’t opening or closing brackets, followed by a closing angle bracket. If you want to make this test ...

Name Regular Expressions The reflector DBM can be asked to search for a common name by means of a Basic UNIX regular expression applied to all common names known to the DBM. A regular expression ...