01-17-2011
how to use grep: finding a string with double quotes and multiple digits
I have a file with a lot of lines (a lot!) that contain 10 digits between double quotes. ie "1726937489". The digits are random throughout, but always contain ten digits.
I can not for the life of me, (via scouring the internet and grep how-to manuals) figure out how to find this when I search.
I want to delete all of these eventually (not manually... or I'll be doing it until the next ice age) But I want to learn how to locate them first.
Does anyone have any suggestions? I'd appreciate it.
Thanks. Looking forward to learning a lot from this forum, and maybe I can help someone else out one of these days once I know what I'm doing.
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LEARN ABOUT PHP
ctype_xdigit
CTYPE_XDIGIT(3) 1 CTYPE_XDIGIT(3)
ctype_xdigit - Check for character(s) representing a hexadecimal digit
SYNOPSIS
bool ctype_xdigit (string $text)
DESCRIPTION
Checks if all of the characters in the provided string, $text, are hexadecimal 'digits'.
PARAMETERS
o $text
- The tested string.
RETURN VALUES
Returns TRUE if every character in $text is a hexadecimal 'digit', that is a decimal digit or a character from [A-Fa-f] , FALSE otherwise.
EXAMPLES
Example #1
A ctype_xdigit(3) example
<?php
$strings = array('AB10BC99', 'AR1012', 'ab12bc99');
foreach ($strings as $testcase) {
if (ctype_xdigit($testcase)) {
echo "The string $testcase consists of all hexadecimal digits.
";
} else {
echo "The string $testcase does not consist of all hexadecimal digits.
";
}
}
?>
The above example will output:
The string AB10BC99 consists of all hexadecimal digits.
The string AR1012 does not consist of all hexadecimal digits.
The string ab12bc99 consists of all hexadecimal digits.
NOTES
Note
If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative val-
ues have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string contain-
ing the decimal digits of the integer.
SEE ALSO
ctype_digit(3).
PHP Documentation Group CTYPE_XDIGIT(3)