By Chris Newman
Are you a kind of those that imagine there is not something giant for you to do in just 10 mins? re-evaluate. Sams educate your self personal home page in 10 mins is a no-fluff, just-the-answers consultant to construction dynamic web pages utilizing personal home page. damaged into 10 minute classes, you'll achieve a speedy operating wisdom of Hypertext Preprocessor five and have the ability to instantly placed that wisdom to take advantage of in functional purposes. Who ever may have inspiration there has been quite a bit you may do in exactly 10 mins!
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However, a single letter and number or a longer combination would not match. ) character indicates that the preceding item may appear either once or not at all. The same behavior could be achieved by using {0,1} to specify the number of times to repeat a pattern. Some Practical Examples You use regex mostly to validate user input in scripts, to make sure that a value entered is acceptable. The following are some practical examples of using regular expressions. Zip Codes If you have a customer's zip code stored in $zip, you might want to check that it has a valid format.
Compound Operators Compound operators provide a handy shortcut when you want to apply an arithmetic operation to an existing variable. The following example uses the compound addition operator to add six to the current value of $count: $count += 6; The effect of this is to take the initial value of $count, add six to it, and then assign it back to $count. 1. 1. Compound Operators Operator $a += $b $a -= $b Equivalent To $a = $a + $b; $a = $a - $b; 37 38 $a *= $b $a /= $b $a %= $b $a = $a * $b; $a = $a / $b; $a = $a % $b; Operator Precedence The rules governing operator precedence specify the order in which expressions are evaluated.
The following examples, which use the * and + characters, are very similar to one another. They both match a string of any length that contains only alphanumeric characters. However, the first condition also matches an empty string because the asterisk denotes zero or more occurrences of [[:alnum::]]: if (ereg("^[[:alnum:]]*$", $phrase)) ... if (ereg("^[[:alnum:]]+$", $phrase)) ... 60 61 To denote a group of matching characters that should repeat, you use parentheses around them. For example, the following condition matches a string of any even length that contains alternating letters and numbers: if (ereg("^([[:alpha:]][[:digit:]])+$", $string)) ...