RegEx : The Right Way | * and + operators

Till now we have covered the Dot Operator and the ? Operator for optional characters. To see all the articles of this Regular Expressions series, click here .

In this lesson we are going to see how to match multiple characters at once. The number of characters can be anything. And, the * and + operators are going to help us with that.

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RegEx : The Right Way | Optional Characters?

We have already seen how to use the dot operator in Regular Expressions in the last tutorial (Link). To see all the articles of this Regular Expressions series, click here .

In this lesson, we will see what to do when some characters you want to match are optional, i.e., if they are present, match them and if they are not, don't bother.
So, Imagine a situation where you want to match foo and foobar. Hence, bar is optional. Then, what do we do to match and identify such words? Let's see ...

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RegEx : The Right Way | Dot Operator

Let's continue with Regular Expressions. All articles in this series can be found here. I will be using Regexr.com for most of these tutorials. It is a great site, where you can write and validate your regular expressions against your desired input text.

Now, Let's look at how regular expressions usually look like..

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RegEx : The Right Way |Tutorial 1

Regular Expressions or RegEx is  a sequence of characters that define a search pattern. Regex is every where these days and you can use it to extract information from Text files, Log files, Dictionaries, Spread sheets and even webpages. Every major programming language has support for Regular Expressions. Most importantly grep, awk and  sed use regex to find/replace matches.

Regular Expressions can help you save a lot of time. Instead of writing complex String pattern searches which span over multiple lines, regex gets the job done really easily and really fast.

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