JavaScript Regular Expressions

Appendix A. JavaScript Regex Cheat Sheet

In this appendix, you can find a summary of the patterns used in regular expressions in JavaScript along with their descriptions, and a list of useful methods to test and create regular expressions.

The following Regex topics will be covered in this appendix:

• Character classes and literals
• Character sets
• Boundaries and quantifiers
• Grouping, alternation, and back reference
• Useful methods

Character classes

In the following table, you can find the patterns for character classes, which tell the Regex to match a single character:

Pattern	Description	Example
.	This matches any character, except newline or another unicode line terminator, such as (\n, \r, \u2028 or \u2029).	/f.o/ matches "fao", "feo", and "foo" ...