Pursuing MCA from YMCA University, Faridabad
We need subexpressions for complex and refined output. We can refine our output by grouping the expressions. E.g. Test Case – HelloHello RegEx – Hello{2,} Result – Hello{2,} It will not match any Hello because above expression is finding 'Hell' and atleast two occurence of 'o'. So, we need to create Read more…
Using Boundaries : Position matching is used to specify where within a string of text a match should occur. To understand the need for position matching,consider the following example: TEXT The cat scattered his food all over the room. REGEX cat RESULT The cat scattered his food all over the Read more…
Matching One or More Characters To match one or more instances of a character (or set),simply append a + character. + matches one or more characters (at least one; zero would not match). Whereas a matches a, a+ matches one or more as. Similarly, whereas [0-9] matches any digits, [0-9]+ Read more…
Escaping : Metacharacters are characters that have special meaning within regular expressions. The period (.) is a metacharacter; it is usedto match any single character. Similarly, the left bracket ([) is a metacharacter; it is used to mark the beginning of a set. Because metacharacters take on special significance when Read more…
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Sometime we want to fetch the information from a domain. In PHP file_get_contents function would work fine. We can easily get few pages without getting blocked but if we want to circumvent few security measures then we have to use CURL with proxy and custom headers. Below is the example of Read more…
1. In a switch statement 'default' case is written at the end or at the start or wherever we want inside switch? — It can be written anywhere in switch control instruction as an independent case. 2. Is the below format of 'for' loop is correct? [crayon-5a2bb39931133292187897/] — Read more…
1. What do you mean by scope of a variable? What are the different types of scopes that a variable can have? — Scope Indicates the region over which the variable's declaration has an effect. The four kinds of scopes are — file,function,block,prototype. 2. What are differences between a Read more…
There are few tips here which will help you protect your vps against attacks: 1. Change SSH port : you can change it be logging into you server console with root privilages. Then type [crayon-5a2bb399319c7418567755/] and find line #22 and replace it with the port you want to Read more…
In Unix, how do I kill another login session remotely? You can kill a Unix/Linux login session remotely by sending a hangup signal (SIGHUP) to the process running the login session. To do this, follow the steps below: Identify the shell you want to kill. To determine your current tty, from your Read more…