Beginner

Understand Regular Expressions

Does the thought of a confusing regular expression send chills down your back? Don't worry; you're in the majority. But, luckily, the truth is that the trick to understanding regular expressions simply boils down to basic memorization. It's not that tough, once you know what you're looking for.

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  • 01

    Episode 1 Run Time 13:17

    A Birds-Eye View Free

    To begin this series, let's zoom out for a few moments, and review what regular expressions look like, how we can write our own, and what that might look like in our PHP code.

  • 02

    Episode 2 Run Time 9:09

    Alternation

    Let's slow down a bit, and focus on a silly example, that will allow us to review such topics as alternation, optional sequences, and non-capturing groups.

  • 03

    Episode 3 Run Time 10:05

    Character Sets

    Character sets allow us to match any one token, out of a group of characters. As you'll find, this can be incredibly powerful. Let me show you.

  • 04

    Episode 4 Run Time 6:07

    Greediness

    Using a practical, real world example, let's review regular expression greediness in this episode.

  • 05

    Episode 5 Run Time 8:02

    Lookaheads and Lookbehinds

    Often, you'll find yourself in the position of needing to match a set of characters only if they are proceeded or preceded by another sequence. When writing regular expressions, we can use lookaheads and lookbehinds to allow for this.

  • 06

    Episode 6 Run Time 8:28

    PHP's Regular Expressions Support

    So far, we've mostly been focusing on the regular expression syntax. But, now, let's switch over to PHP and learn about the various regex-specific functions that are available to us.