We know that these regular expressions, allows you to write less lines of code 1000
We know that these regular expressions, can make you less write 1,000 lines of code
Regular expressions, a very old and powerful text processing tools, in just a very brief expression statement, will be able to quickly implement a very complex business logic. Mastered regular expressions, you can make your development efficiency greatly improved.
Regular expressions are often used to check or any string fields, such as date formats substantially below this check JavaScript code:
var reg = /^(\\d{1,4})(-|\\/)(\\d{1,2})\\2(\\d{1,2})$/; was r = fieldValue.match (reg); if(r==null)alert('Date format error!');The following is a technical Carpenter finishing, frequently used in front-end development in 20 regular expressions.
1. Verification password strength
Strength of the password must contain a combination of uppercase and lowercase letters and numbers, special characters can not be used, a length of between 8-10.
^(?=.*\\d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$2. Verify Chinese
String only is Chinese.
^[\\u4e00-\\u9fa5]{0,}$3. The string of digits, letters or underscore 26 composed of
^\\w+$4. Verify E-Mail Address
Like password, below is the E-mail address regular compliance checks statement.
[\\w!#$%&'*+/=?^_`{|}~-]+(?:\\.[\\w!#$%&'*+/=?^_`{|}~-]+)*@(?:[\\w](?:[\\w-]*[\\w])?\\.)+[\\w](?:[\\w-]*[\\w])?The ID number verification
The following is a regular check identity card number. 15 or 18.
15th place:
^[1-9]\\d{7}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}$# 18:
^[1-9]\\d{5}[1-9]\\d{3}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}([0-9]|X)$6. Verify date
"Yyyy-mm-dd" format check date has been considered flat leap years.
^(?:(?!0000)[0-9]{4}-(?:(?:0[1-9]|1[0-2])-(?:0[1-9]|1[0-9]|2[0-8])|(?:0[13-9]|1[0-2])-(?:29|30)|(?:0[13578]|1[02])-31)|(?:[0-9]{2}(?:0[48]|[2468][048]|[13579][26])|(?:0[48]|[2468][048]|[13579][26])00)-02-29)$7. check amount
Check amount, accurate to two decimal places.
^[0-9]+(.[0-9]{2})?$8. check phone number
Here is the phone number 13, 15 at the beginning of the regular expression. (Can be extended according to the first two numbers at the beginning of the current domestic collection number)
^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\\d{8}$IE version 9. Analyzing
IE yet to be completely replaced, still need to do a lot of pages compatible version, the following expression is IE version check.
^.*MSIE [5-8](?:\\.[0-9]+)?(?!.*Trident\\/[5-9]\\.0).*$10. Verify IP-v4 address
IP4 regular statements.
\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b11. The IP-v6 address check
IP6 regular statements.
(([0-9a-fa-F] {1,4}) {7.7} [0-9a-fa-F] {1,4} | ([0-9a-fa-F] {1 4}) {1,7}: | ([0-9a-fa-F] {1,4}) {1.6} [0-9a-fa-F] {1,4} | ([0-9a-fa-F] {1,4}) {1.5} ([0-9a-fa-F] {1,4}) {1,2} | ([0-9a -fA-F] {1,4}) {1,4} ([0-9a-fa-F] {1,4}) {1,3} | ([0-9a-fa-F] {1,4}) {1,3} ([0-9a-fa-F] {1,4}) {1,4} | ([0-9a-fa-F] {1,4} :) {1,2} ([0-9a-fa-F] {1,4}) {1.5} | [0-9a-fa-F] {1,4}: ((: 0 -9a-fA-F] {1,4}) {1.6}) |: ((: [0-9a-fa-F] {1,4}) {1,7} |) | fe80: ([0-9a-fa-F] {0,4}) {0,4}% [0-9a-ZA-Z] {1} |: :( ffff (0 {1,4}) {0,1}) {0,1} ((25 [0-5] | (2 [0-4] | 1 {0,1} [0-9]) {0,1} 0-9 ]) \\.) {3,3} (25 [0-5] | (2 [0-4] | 1 {0,1} [0-9]) {0,1} [0-9]) | ([0-9a-fa-F] {1,4}) {1,4}: ((25 [0-5] | (2 [0-4] | 1 {0,1} [0- 9]) {0,1} [0-9]) \\.) {3,3} (25 [0-5] | (2 [0-4] | 1 {0,1} [0-9] ) {0,1} [0-9]))12. Check the URL prefix
Application development is often necessary to distinguish between requests HTTPS or HTTP, a prefix may be removed and then the url logical judgment by the following expression.
if (!s.match(/^[a-zA-Z]+:\\/\\//)) { s = 'http://' + s; }
13. The extract URL link
The following expression can be selected piece of text in the URL.
^(f|ht){1}(tp|tps):\\/\\/([\\w-]+\\.)+[\\w-]+(\\/[\\w- ./?%&=]*)?14. The path and file name extensions check
Verify the path and file name extension under Windows (the example below as a .txt file)
^([a-zA-Z]\\:|\\\\)\\\\([^\\\\]+\\\\)*[^\\/:*?"<>|]+\\.txt(l)?$15. 提取Color Hex Codes
Sometimes the color code needs to be extracted a Web page, the following expression may be used.
# ^ ([A-Fa-F0-9] {6} | [A-Fa-F0-9] {3}) $16. The extract Web Images
If you want to extract all the image info pages, you can use the following expression.
\\< *[img][^\\\\>]*[src] *= *[\\"\\']{0,1}([^\\"\\'\\ >]*)17. The extract page hyperlinks
Extract hyperlinks in html.
(<a\\s*(?!.*\\brel=)[^>]*)(href="https?:\\/\\/)((?!(?:(?:www\\.)?'.implode('|(?:www\\.)?', $follow_list).'))[^"]+)"((?!.*\\brel=)[^>]*)(?:[^>]*)>
知道这几个正则表达式，能让你少写 1,000 行代码
正则表达式，一个十分古老而又强大的文本处理工具，仅仅用一段非常简短的表达式语句，便能够快速实现一个非常复杂的业务逻辑。熟练地掌握正则表达式的话，能够使你的开发效率得到极大的提升。
正则表达式经常被用于字段或任意字符串的校验，如下面这段校验基本日期格式的JavaScript代码：
var reg = /^(\\d{1,4})(-|\\/)(\\d{1,2})\\2(\\d{1,2})$/;
var r = fieldValue.match(reg);
if(r==null)alert('Date format error!');
下面是技匠整理的，在前端开发中经常使用到的20个正则表达式。
1 . 校验密码强度
密码的强度必须是包含大小写字母和数字的组合，不能使用特殊字符，长度在8-10之间。
^(?=.*\\d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$
2. 校验中文
字符串仅能是中文。
^[\\u4e00-\\u9fa5]{0,}$
3. 由数字、26个英文字母或下划线组成的字符串
^\\w+$
4. 校验E-Mail 地址
同密码一样，下面是E-mail地址合规性的正则检查语句。
[\\w!#$%&'*+/=?^_`{|}~-]+(?:\\.[\\w!#$%&'*+/=?^_`{|}~-]+)*@(?:[\\w](?:[\\w-]*[\\w])?\\.)+[\\w](?:[\\w-]*[\\w])?
5. 校验身份证号码
下面是身份证号码的正则校验。15 或 18位。
15位：
^[1-9]\\d{7}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}$
18位：
^[1-9]\\d{5}[1-9]\\d{3}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}([0-9]|X)$
6. 校验日期
“yyyy-mm-dd“ 格式的日期校验，已考虑平闰年。
^(?:(?!0000)[0-9]{4}-(?:(?:0[1-9]|1[0-2])-(?:0[1-9]|1[0-9]|2[0-8])|(?:0[13-9]|1[0-2])-(?:29|30)|(?:0[13578]|1[02])-31)|(?:[0-9]{2}(?:0[48]|[2468][048]|[13579][26])|(?:0[48]|[2468][048]|[13579][26])00)-02-29)$
7. 校验金额
金额校验，精确到2位小数。
^[0-9]+(.[0-9]{2})?$
8. 校验手机号
下面是国内 13、15、18开头的手机号正则表达式。（可根据目前国内收集号扩展前两位开头号码）
^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\\d{8}$
9. 判断IE的版本
IE目前还没被完全取代，很多页面还是需要做版本兼容，下面是IE版本检查的表达式。
^.*MSIE [5-8](?:\\.[0-9]+)?(?!.*Trident\\/[5-9]\\.0).*$
10. 校验IP-v4地址
IP4 正则语句。
\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b
11. 校验IP-v6地址
IP6 正则语句。
(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))
12. 检查URL的前缀
应用开发中很多时候需要区分请求是HTTPS还是HTTP，通过下面的表达式可以取出一个url的前缀然后再逻辑判断。
if (!s.match(/^[a-zA-Z]+:\\/\\//))
{
s = 'http://' + s;
}
13. 提取URL链接
下面的这个表达式可以筛选出一段文本中的URL。
^(f|ht){1}(tp|tps):\\/\\/([\\w-]+\\.)+[\\w-]+(\\/[\\w- ./?%&=]*)?
14. 文件路径及扩展名校验
验证windows下文件路径和扩展名（下面的例子中为.txt文件）
^([a-zA-Z]\\:|\\\\)\\\\([^\\\\]+\\\\)*[^\\/:*?"<>|]+\\.txt(l)?$
15. 提取Color Hex Codes
有时需要抽取网页中的颜色代码，可以使用下面的表达式。
^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$
16. 提取网页图片
假若你想提取网页中所有图片信息，可以利用下面的表达式。
\\< *[img][^\\\\>]*[src] *= *[\\"\\']{0,1}([^\\"\\'\\ >]*)
17. 提取页面超链接
提取html中的超链接。
(<a\\s*(?!.*\\brel=)[^>]*)(href="https?:\\/\\/)((?!(?:(?:www\\.)?'.implode('|(?:www\\.)?', $follow_list).'))[^"]+)"((?!.*\\brel=)[^>]*)(?:[^>]*)>Reprinted link address: http://cssteach.com/html/show-10-137.html