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JavaScript Regular Expression | JavaScript Regex | JavaScript Tutorial For Beginners | Simplilearn

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7 diapositives · 153 Views · Jul 05, 2020

This video on JavaScript Regular Expressions will introduce you to the basic working of these expressions. A Regular Expression is a sequence of characters that forms a search pattern. This sequence can be used for text search and text replacement. To help understand the concepts better, we explain what patterns, flags and quantifiers along with a demo of examples.

Website used for the demo - https:\/\/regexr.com\/

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JavaScript Regular Expression | JavaScript Regex | JavaScript Tutorial For Beginners | Simplilearn
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Transcription de la présentation
  1. What are Regular expressions? A regular expression is a sequence of characters that forms a search pattern AaBbCc…1234.. !@#$%^ The user can define what needs to be searched in a text with the help of regular expressions Regular expressions can be of any number of characters, be it alphabet, digits or special characters These expressions are more commonly used for text search and text replacement operations General Syntax: /pattern/flag

  2. Flags, Patterns and Quantifiers Flags There are several flags you can specify to alter the behaviour of a regular expression. Flags may be appended to the end of a regex literal or they may be specified as the second argument to the Regular expression

  3. Click here to watch the video

  4. Flags, Patterns and Quantifiers Patterns Brackets are used to find the range of characters

  5. Flags, Patterns and Quantifiers Quantifiers Quantifiers define the number of occurrences of a string