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Bookmark or Share- What does this regular expression mean /^[a-z]{1}[a-z0-9_]{3,13}$/The ^ anchor asserts that we are at the beginning of the string. [a-z]{1} matches one lower-case letter. The {1} is unneeded. [a-z0-9_]{3,13} matches 3 to 13 chars. In case-insensitive mode, in many engines it could be replaced by \w{3,13} The $ anchor asserts that we are at the end of the string.
- What is the difference between i++ & ++i in a for loop?votes. The way for loop is processed is as follows. 1 First, initialization is performed (i=0) 2 the check is performed (i
- How to set the environment variables for Java in WindowsStep 1 : Right Click on MyComputer and click on properties . Step 2 : Click on Advanced tab. Step 3: Click on Environment Variables. Step 4: Create a new class path for JAVA_HOME. Step 5: Enter the Variable name as JAVA_HOME and the value to your jdk bin path ie c:\Programfiles\Java\jdk-1.6\bin and.
- What is the difference between i++ and ++i in C#?i++ means 'tell me the value of i, then increment'. ++i means 'increment i, then tell me the value'. They are Pre-increment, post-increment operators. In both cases the variable is incremented, but if you were to take the value of both expressions in exactly the same cases, the result will differ.
- What's the difference between <b> and <strong>, <i> and <em>?HTML5 has new semantic meanings for b and i.They are tags you should use when you need to draw attention to a part of prose, or to offset normal prose, without conveying emphasis (em), importance (for strong), or relevance (for mark).
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