regexp help

Anon

I am trying to do the following and can't get it to work.

In a string I have things like the following %F1%, %F2%, etc. I want to replace them with $Var1, $Var2, etc, respectively. I have tried the following but it doesnt work.

eregi_replace("%F([1-10])%", "$Var\1", $string)

any idea how to get this to work?

Thanks

Anon

I'm not sure but maybe this will work:

eregi("%F([0-9])%", "$Var[\1]", $string);

But then you would have to replase all those $Var1, $Var2 with $Var[1], $Var[2] and so on..

Andreas Bernhardsen

Anon

When I do that I get a parse error.

Any other solutions?

Anon

Isn't the % sign a special character? Maybe you should escape it like this:

eregi_replace("\%F([1-10])\%", "$Var\1", $string)

also, there are only 10 different F# 's?

Anon

actually I am only trying to replace %F1%-%F9%

If regexp finds the right places in the string but instead of replacing it with $Var1-$Var9 it replaces it with the value of $Var followed by the number 1-9.

Anon

Here's a little demonstration I put together and tested that will show you how to do what you are trying to do...

Notes:

The []'s are a character class and the [1-10] is basically saying match 1-1 and 0 only one time so it will match one instance of 1 or zero only.

To say any number between 1 and ten you do this:

([1-9]|10)

Literally translated it says any number between 1 and 9 or ten.

\1 in the replace string will not work to reference a variables name, it will only add that subpatterns match there as text.

<?php

// define the $Var array
$Var[0]="#one#";
$Var[1]="#two#";
$Var[2]="#three#";
$Var[3]="#four#";
$Var[4]="#five#";
$Var[5]="#six#";
$Var[6]="#seven#";
$Var[7]="#eight#";
$Var[8]="#nine#";
$Var[9]="#ten#";

// define regex patterns for matching
$Regex[0]="/%F1%/iU";
$Regex[1]="/%F2%/iU";
$Regex[2]="/%F3%/iU";
$Regex[3]="/%F4%/iU";
$Regex[4]="/%F5%/iU";
$Regex[5]="/%F6%/iU";
$Regex[6]="/%F7%/iU";
$Regex[7]="/%F8%/iU";
$Regex[8]="/%F9%/iU";
$Regex[9]="/%F10%/iU";

// example string
$string="This %F5% is %F2% some %f3% text %F2% %F10% %F4% with %f1% ten %F6% variables %f7% in %F8% it %F9% %F10% and even a an %F11% with a few % signs %F %F";

// replace %F1-10% in $string with $Var literal
$literal_string=preg_replace("/%F([1-9]|10)%/iU", "\$Var\1", $string);

echo "Replaced with \$Var literal: \n";
echo "--------------------------------------------- \n";
echo "\$string=\"".$string."\" \n";
echo "\$literal_string=\"".$literal_string."\" \n";

// replace %F1-10% with corresponding $Var value
$value_string=preg_replace($Regex, $Var, $string);

echo "Replaced with \$Var value: \n";
echo "--------------------------------------------- \n";
echo "\$string=\"".$string."\" \n";
echo "\$value_string=\"".$value_string."\" \n";

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