How to use regular delete strings to the left, right, or both ends
This article will explain in detail how to use the left, right or both ends of the regular deletion string. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.
1. Eliminate the space on the left side of the string
The copy code is as follows:
Function leftTrim (str) {
The return str.replace (/ ^\ smatching account, ""); / / ^ symbol means to match from the beginning, namely to the left.
}
/ / alert ("111s" + leftTrim ("aaa") + "111s"); / / the 111s on both sides are used as a reference to determine whether the space is deleted.
two。 Eliminate the spaces on the right side of the string
The copy code is as follows:
Function rightTrim (str) {
Return str.replace (/\ sfavorite account, "")
}
/ / alert ("111s" + rightTrim ("aaa") + "111s"); / / the 111s on both sides are used as a reference to determine whether the space is deleted.
3. Eliminate spaces on both sides of a string
The copy code is as follows:
Function trim (str) {
Return str.replace (/ (^\ s *) | (\ s $) / g, "")
}
/ / alert ("111s" + trim ("aaa") + "111s"); / / the 111s on both sides are used as a reference to determine whether the space is deleted.
Of course, for convenience, we can also expand the functions in the string.
The copy code is as follows:
String.prototype.trim = function () {
Return trim (this)
}
Var str = "aaa"
Alert ("111s" + str.trim () + "111s"); / / the 111s on both sides are used as a reference to determine whether the space is deleted.
This is the end of the article on "how to use the left, right or both ends of a regular delete string". I hope the above content can be of some help to you, so that you can learn more knowledge. If you think the article is good, please share it for more people to see.
