JavaScript - regular expressions

JavaScript advanced day 04 notes 0. Why use regular expressions* For example: find a number in a string var str = '3s4 d5 f6gy uiml,./567y ghv/.,'; var arr = []; var temp = ''; for(var i = 0; i < str.length; i++){ if(str.charAt(i) >= '0' && str.charAt(i) <= '9'){ tem ...

Posted by chet23 on Mon, 25 Oct 2021 16:11:19 +0200

Crawler operation section 2 - Data Analysis

Blog direct in the last section! After obtaining the web page, the next step is to analyze the data. We need to be familiar with the basic operation of regular expressions. Here is a tutorial entrance. Students without knowledge reserve can go to this channel first regular expression You can only look at the simplest "grammar" sec ...

Posted by evilmonkey on Wed, 20 Oct 2021 09:26:00 +0200

flutter regular expressions such as mailbox, phone, web address, etc

Fluent regular expression processing Usage scenario When using fluent, you need to operate the phone, e-mail and web address in the string. The conventional writing method takes a lot of time and energy. Here, bloggers find a better plug-in to share with you. This is a gif of this plug-in. You can see that it has powerful functions. You can c ...

Posted by cypher235 on Sat, 09 Oct 2021 11:25:24 +0200

20 API 1-2 regular expression packing class auto boxing / Auto unpacking BigDecimal

1 regular expression Regex 1.1 general Correct string format rules. It is often used to judge whether the content entered by the user meets the format requirements. Note that it is strictly case sensitive; 1.2 common syntax 1.3 String provides methods to support regular expressions Matches: can the current string match a regular expressi ...

Posted by phence on Sat, 25 Sep 2021 11:53:16 +0200

@Constraint Custom Validation Type Comment

/** * Bank card verification */ @Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER}) @Retention(RUNTIME) @Documented @Constraint(validatedBy = {StringChecker.class, ObjectChecker.class}) public @interface BankCard { String message() default "Bad format of bank card number"; Class<?>[] groups() default {}; Class& ...

Posted by dw89 on Sun, 19 Sep 2021 18:53:19 +0200