Regular expressions for web programming

Regular expressions are not optional, they are required

We have to use a lot of regular expressions in our programming process.

The most representative case is the verification process for user input values in web programming.

Here's an example of inflearn's sign-up screen. It's horrifying to think that the user input is in the correct email format and that the password complexity complies with the guidelines, but it's handled as a string.

It is also used for string pattern search in various programming fields such as Java, JavaScript, and SQL.

 public C regexMatchers ( String ... regexPatterns ) {
  Assert . state (! this . anyRequestConfigured , 
               "Can't configure regexMatchers after anyRequest" );
  return chainRequestMatchers ( RequestMatchers . regexMatchers (regexPatterns));
}

It's just a simple string, but when you look at the expression, you wonder what it means.

 ^ [\w.-] {1,64}@ [\w.-] {1,252}\.\w{2,4}$

It's not that difficult once you know a few things!

Regular expressions use a few metacharacters to construct patterns and perform search and replacement operations. When I first learned Korean, even the letters ㄱ, ㄴ, and ㄷ were difficult, but now I can read and write them with ease. Just like that, regular expressions are easy to learn once you learn just a few metacharacters.

Frankly, it's not easy to masterfully create patterns using regular expressions. Fortunately, many of the regular expressions we need have already been developed, but they simply don't fit our needs perfectly. Therefore, the only skill we need is to find expressions that fit our needs, read them, and modify them slightly to suit our needs.

Even if you don't necessarily need to become a master of regular expressions, don't you need the ability to comfortably read other regular expressions and modify them to suit the situation of your project/code?