Remove a string from the beginning of a string

Viewed 76 times

I have a string that looks like this:

$str = "bla_string_bla_bla_bla";

How can I remove the first bla_; but only if it's found at the beginning of the string?

With str_replace(), it removes all bla_'s.

Answers

Plain form, without regex:

$prefix = 'bla_';
$str = 'bla_string_bla_bla_bla';

if (substr($str, 0, strlen($prefix)) == $prefix) {
    $str = substr($str, strlen($prefix));
}

Takes: 0.0369 ms (0.000,036,954 seconds)

And with:

$prefix = 'bla_';
$str = 'bla_string_bla_bla_bla';
$str = preg_replace('/^' . preg_quote($prefix, '/') . '/', '', $str);

Takes: 0.1749 ms (0.000,174,999 seconds) the 1st run (compiling), and 0.0510 ms (0.000,051,021 seconds) after.

Profiled on my server, obviously.

Wednesday, December 14, 2022

digisolgr-9ec72aba7d7a

You need a Ajax call to pass the JS value into php variable

JS Code will be (your js file)

var jsString="hello";
$.ajax({
    url: "ajax.php",
    type: "post",
    data: jsString
});

And in ajax.php (your php file) code will be

$phpString = $_POST['data'];     // assign hello to phpString

Thursday, November 10, 2022

mrvaldez

alert('my name is: <?php echo $man; ?>' );

Friday, August 19, 2022

rod_hyde

strip doesn't mean "remove this substring". x.strip(y) treats y as a set of characters and strips any characters in that set from both ends of x.

On Python 3.9 and newer you can use the removeprefix and removesuffix methods to remove an entire substring from either side of the string:

url = 'abcdc.com'
url.removesuffix('.com')    # Returns 'abcdc'
url.removeprefix('abcdc.')  # Returns 'com'

The relevant Python Enhancement Proposal is PEP-616.

On Python 3.8 and older you can use endswith and slicing:

url = 'abcdc.com'
if url.endswith('.com'):
    url = url[:-4]

Or a regular expression:

import re
url = 'abcdc.com'
url = re.sub('.com$', '', url)

Tuesday, November 8, 2022

iavr

As @Mitch said,

//  using System.Text.RegularExpressions;

/// <summary>
///  Regular expression built for C# on: Thu, Sep 25, 2008, 02:01:36 PM
///  Using Expresso Version: 2.1.2150, http://www.ultrapico.com
///  
///  A description of the regular expression:
///  
///  Match expression but don't capture it. [<brs*/?>], any number of repetitions
///      <brs*/?>
///          <
///          br
///          Whitespace, any number of repetitions
///          /, zero or one repetitions
///          >
///  End of line or string
///  
///  
/// </summary>
public static Regex regex = new Regex(
    @"(?:<brs*/?>)*$",
    RegexOptions.IgnoreCase
    | RegexOptions.CultureInvariant
    | RegexOptions.IgnorePatternWhitespace
    | RegexOptions.Compiled
    );
regex.Replace(text, string.Empty);

Saturday, August 20, 2022

shangari_c

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Remove a string from the beginning of a string

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