All the strings in JS are replaced

No more nonsense, direct hair results.

In JS, the whole string substitution can be in the following ways:

　

Str.replace (/string/g to be replaced, "new string")

Like what:

"Yyyy-mm-dd-hh-mm-ss". Replace (/-/g, "/")

The results are as follows:
"Yyyy/mm/dd/hh/mm/ss"

Principle See JavaScript Replace () method introduction

Definition and usage

The replace () method is used to replace other characters with some characters in a string, or to replace a substring that matches a regular expression.

Grammar

Stringobject.replace (regexp/substr,replacement)

Parameters	Description
Regexp/substr	Necessary. A RegExp object that specifies the substring or pattern to replace. Note that if the value is a string, it is used as the direct volume text pattern to be retrieved, instead of being converted to the RegExp object first.
Replacement	Necessary. A string value. A function that specifies replacement text or generates alternate text.

return value

A new string that is obtained after the first match or all matches of regexp have been replaced with replacement .

Description

The replace () method of the string Stringobject performs a find-and-replace operation. It looks for substrings in Stringobject that match regexp, and then replaces them with replacement . If RegExp has global flag G, then the Replace () method replaces all matching substrings. Otherwise, it replaces only the first matched substring.

replacement can be a string, or it can be a function. If it is a string, then each match is replaced by a string. However, the $ character in replacement has a specific meaning. As shown in the following table, it shows that the resulting string from a pattern match will be used for substitution.

character	Replace text
$, $ 、...、	The text that matches the 1th to 99th sub-expression in RegExp.
$&	A substring that matches the regexp.
$`	The text that is located to the left of the matching substring.
$	The text on the right side of the matching substring.
$$	Direct volume symbol.

Note: ECMAScript v3 stipulates that the parameter replacement of the replace () method can be a function instead of a string. In this case, each match calls the function, and the string it returns is used as the replacement text. The first parameter of the function is a string that matches the pattern. The next parameter is a string that matches the subexpression in the pattern and can have 0 or more of these parameters. The next argument is an integer that declares where the match appears in the Stringobject. The last parameter is the stringobject itself.

JS string Replacement Reference: http://www.w3school.com.cn/jsref/jsref_replace.asp

JS Regular use reference: http://www.w3school.com.cn/jsref/jsref_obj_regexp.asp

Original address: https://www.cnblogs.com/cblogs/p/9293522.html

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All the strings in JS are replaced