str为要去除空格的字符串:
去除所有空格:
str = str.replace(/\s+/g,"");
去除两头空格:
str = str.replace(/^\s+|\s+$/g,"");
去除左空格:
str=str.replace( /^\s/, '');
去除右空格:
str=str.replace(/(\s$)/g, "");
提取汉字:
str.replace(/[^\u4e00-\u9fa5]/gi, '')
去除回车、换行符
str = str.replace(/\n|\r|\t/g,"")
微信号正则
var wxreg=/ ^[a-zA-Z]{1}[-_a-zA-Z0-9]{5,19}$/;
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