PHP: RegEx to detect normal human readable string? [closed] - php

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say I have few String's like:
[0]Hey how are you?
[1]13A315Bdas
[2]d3s315
[3]Billy
[4]daa2315Fasd
How can I use regex in PHP to roll out number 1, 2 and 4 as invalid strings and keep 0 and 3 as valid strings?
So something like:
LettersNumbersLetters = false;
NumbersLetters = false;
Numbers = true;
Letters = true;
So either just Numbers in String is valid, or just letters in String is valid.


You can use (?<=^\[)[035-9](?=\]) regex and if a string contains a match, it is valid. See demo on regex101.com.

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Match string format with regex [closed]

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I know there are tons of questions about regex string format, but I am very new to this and I haven't been able to do it myself. How can I use regex to match a string with the following format?
xx_x_a.zip
where x is a number and a is a letter. Example:
33_2_f.zip
It must not match:
33_2_f_abc.zip
The format must always be like 2digits+_+1digit+_+1letter+.zip

Simplest way:
/^[0-9]{2}_[0-9]_[a-z]\.zip$/

preg match extract digits from string after pattern [closed]

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I have a string of the form
<something>_string_t_<digits>
How can I extract just the <digits> portion in PHP ? I need to detect the string_t first and then pull out the digits.

You want something like this:
$captures;
preg_match('/string_t_(\d+)/', $string, $captures);
do_something($captures[1]);
$captures[1] will contain <digits> (assuming <digits> is composed entirely of numbers - if it's not, use the more general (.+) in place of (\d+)).

PHP - Substring processing [closed]

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I have a set of strings that are in the format of This.is.An.Example.YYYY.More.Data.Here where YYYY is any valid year and I would like to get the string up until YYYY in the example so I would end up with a string that is This.is.an.Example.

You can do this with a simple regex, \d{4}.
$splitted = preg_split('~\d{4}~', 'This.is.An.Example.2015.More.Data');
echo $splitted[0];
Output:
This.is.An.Example.
This will split one every 4 continuous single numbers (0-9). Since you only care about what is the first instance use the 0 index.
Sample: http://sandbox.onlinephpfunctions.com/code/640224e9bda3e6cd5c3e012a1bb901dc1e6a34b4

Vague question, so I choose the simplest version ;-)
<?php
$in = 'This.is.An.Example.2015.More.Data.Here';
$out = strstr($in, '.2015', true);
echo $out;
prints This.is.An.Example
see http://docs.php.net/strstr

Restricting input field characters to specific sequence of numbers and dashes in PHP [closed]

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I was wondering if there is a way for PHP to take a string and determine whether it follows a specific pattern of numbers and dashes. For instance, can it check to make sure that that the user inputs 00-00-000-000? So it would be two numbers, hyphen, two numbers, hyphen, three numbers, hyphen, three numbers.

Using anubhava's regex, here is the php:
if (preg_match("/^\d{2}-\d{2}-\d{3}-\d{3}$/", $string))
{
//the string is good
} else {
//the string is bad
die("Invalid string entered");
}

Sure you can match with this regex:
/^\d{2}-\d{2}-\d{3}-\d{3}$/

Regex Replace pattern [closed]

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I need the regular expression to replace using following rule:
Any integer present before . then no take place.
If no integer present before . then that should be replace.
$input = (contain anything characters, symbols, numbers, floats etc)
Example:
$myString = "Example 1.58 Stack.68";
Output should be
Example 1.58 Stack,68

preg_replace('#(?<!\d)\.#',',',$myString)

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