Regular Expression entry: "or" Match

Sometimes, we need to cancel the bold, italic, and other effects in a text segment, we want to match all "<B>", "</B>", "<I>", "</I>", and then replace them with null, we can only match and replace the previous knowledge twice /? B> "," </? I> ".

In a regular expression, you can use "|" to split an expression into two parts: "reg1 | reg2", which means: match all the text that matches the expression reg1 or the text that matches the expression reg2.

<\/?i>|<\/?b>

Effect demonstration Welcome to bkjia.com (BOLD ).
Welcome Bkjia.com(Italic). * 2
Welcome to bkjia.com. * 3 (normal)

This example code

function reg_replace(){var test = document.getElementById("test");var regex = /<\/?i>|<\/?b>/g;test.innerHTML = test.innerHTML.replace(regex,"");}

Additional reading

The topic list of this article is as follows:

1. What is a regular expression?
2. Getting started with regular expressions: match a Fixed Single Character
3. Getting started with regular expressions: matching any single character
4. Getting started with regular expressions: Use character groups
5. Getting started with regular expressions: Use character ranges in character groups
6. Getting started with regular expressions: Use of assense character groups
7. Getting started with regular expressions: matching null characters
8. Getting started with regular expressions: Match one or more characters
9. Regular Expression: matches zero or multiple characters.
10. Regular Expression entry: matches zero or one string.
11. Getting started with regular expressions: Match fixed numbers of Characters
12. Getting started with regular expressions: match the number of characters in a range
13. Getting started with regular expressions: greedy matching
14. Getting started with regular expressions: inert matching
15. Entry to Regular Expressions: two matching Modes
16. Getting started with regular expressions: match word boundaries
17. Getting started with regular expressions: boundary definition and relativity
18. Getting started with regular expressions: Match non-word boundaries
19. Getting started with regular expressions: match the beginning and end of a text
20. Entry to regular expression: submode
21. Regular Expression entry: "or" Match
22. Getting started with regular expressions: replacing with referenced text
23. Getting started with regular expressions: unmatched
24. Regular Expression Summary: Regular Expressions in JavaScript
25. Regular Expression Summary: advanced application of regular expressions in js