What is the difference between the ereg() and preg () functions

From here I'm a little stuck. I have started to learn PHP. So installed WAMP server on my windows 7 machine. I don't have include directory in my www folder. Login using GitHub. Related questions regex - PHP ereg vs. I cannot get the calculator working with float numbers. I tried to understand ereg, but the describtion on php. The following function works for me well and allows an E-Mail to contain the following characters: "A-Z, a-z, ,.

UK postcode validation. We've used the expression put forward by tomas and jaik, but we found that it fails on Coventry CV postcodes. Here is an alternative that works for these postcodes and also adds support for the Overseas Territories like Tristan da Cunha. If you try increasing the number of parenthesis, it just creates duplicates of the same result. A common mistake seems to be trying to escape characters within a bracket expression.

Unlike the preg functions, backslash is always taken literally within a bracket expression using the ereg functions. Some of the posts here can be re-written to be much simpler. The fault with the above is the range a-Z the capital Z comes before small a and so this will fail. While this is relatively simple example, I was unable find a clean method of doing this anywhere else, so I thought I would post it here. PHP provides a variety of functions that allow you to use regular expressions.

Use a regular expression to do a case-insensitive count of the number of occurrences of "ain" in a string:. You can use parentheses to apply quantifiers to entire patterns. They also can be used to select parts of the pattern to be used as a match. Use grouping to search for the word "banana" by looking for ba followed by two instances of na :. One way being the use of ereg function. Examples: In this example, statement checks whether the subject provided to ereg function is a string or not.

Since the value given to compare [a-zA-Z], starting from a to z and A to Z is a range. The ereg function matches capital and small letters as provided in the range. The symbols have their own meaning.

To use preg in your program it is advised to create a regex variable to compare with the subject. The following example provides the same functionality as the above code but by using preg. Skip to content.