What is the function of pattern modifiers in regular expressions

This article will explain in detail what the role of pattern modifiers in regular expressions is, and the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.

Detailed explanation of the role of pattern modifiers in regular expressions (I, g, m, s, x, e)

What is a pattern modifier?

1. Pattern modifiers are several letters, and we can use one at a time or multiple in succession in each regular expression, each of which has a certain meaning.

2. The pattern modifier is used to tune the whole regular expression, or it can be said to be an extension of the regular expression function.

Remember the formula of the regular expression?'/ atom and metacharacter / pattern modifier', where the forward slash is the boundary character.

The composition of pattern modifiers

Pattern modifiers are letters, but these have special meanings in the application of pattern modifiers. Let me see what pattern modifiers are available. Please look at the table below:

Since I means the match is case-insensitive, we won't demonstrate it in the following example, let's take a look at examples of other pattern modifiers.

1, the pattern modifier m.

The code is as follows: