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  1. #1
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    Jan 2014
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    Boston, MA
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    regular expression in php

    i want to do a regular expression to check against valid phone numbers

  2. #2
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    Jun 2014
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    Re: regular expression in php

    Regular expressions are nothing more than a sequence or pattern of characters itself. They provide the foundation for pattern-matching functionality.

    Using regular expression you can search a particular string inside a another string, you can replace one string by another string and you can split a string into many chunks.

    PHP offers functions specific to two sets of regular expression functions, each corresponding to a certain type of regular expression. You can use any of them based on your comfort.

    POSIX Regular Expressions

    PERL Style Regular Expressions

    POSIX Regular Expressions:

    The structure of a POSIX regular expression is not dissimilar to that of a typical arithmetic expression: various elements (operators) are combined to form more complex expressions.

    The simplest regular expression is one that matches a single character, such as g, inside strings such as g, haggle, or bag.

    Lets give explaination for few concepts being used in POSIX regular expression. After that we will introduce you wih regular expression related functions.

    Brackets

    Brackets ([]) have a special meaning when used in the context of regular expressions. They are used to find a range of characters.

    Expression Description
    [0-9] It matches any decimal digit from 0 through 9.
    [a-z] It matches any character from lowercase a through lowercase z.
    [A-Z] It matches any character from uppercase A through uppercase Z.
    [a-Z] It matches any character from lowercase a through uppercase Z.
    The ranges shown above are general; you could also use the range [0-3] to match any decimal digit ranging from 0 through 3, or the range [b-v] to match any lowercase character ranging from b through v.

  3. #3
    Member
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    India
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    Re: regular expression in php

    Hi Jackalls,

    Thanks for brief description about regular expression its really more informative for web developers or designers.

  4. #4
    Senior Member
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    May 2015
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    Gurgaon
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    Re: regular expression in php

    PHP offers functions specific to two sets of regular expression functions, each corresponding to a certain type of regular expression. You can use any of them based on your comfort.

  5. #5
    Senior Member
    Join Date
    Jun 2015
    Location
    Gurgaon
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    195

    Re: regular expression in php

    Regular expressions are nothing more than a sequence or pattern of characters itself. They provide the foundation for pattern-matching functionality.
    PHP offers functions specific to two sets of regular expression functions, each corresponding to a certain type of regular expression. You can use any of them based on your comfort.

    POSIX Regular Expressions

    PERL Style Regular Expressions

  6. #6
    Senior Member
    Join Date
    Jul 2015
    Location
    Delhi
    Posts
    249

    Re: regular expression in php

    Regular expressions are nothing more than a sequence or pattern of characters. There are two types of regular Expression:
    1.POSIX Regular Expressions

    2.PERL Style Regular Expressions

 

 

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