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not understanding pattern matching [message #178609]

Wed, 11 July 2012 22:35

Michael Joel
Messages: 42
Registered: October 2011

Karma: 0

Member

I am wanting to change words in a string that has special tags.
Ex. "This is a %/i%special%i% word in the string."
If I want to replace any word between the %/i% and %i% what would I do?

I messed with preg_repace but I couldn't understand the pattern system.

Mike

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Re: not understanding pattern matching [message #178610 is a reply to message #178609]

Wed, 11 July 2012 22:49

Michael Fesser
Messages: 215
Registered: September 2010

Karma: 0

Senior Member

.oO(Michael Joel)

> I am wanting to change words in a string that has special tags.
> Ex. "This is a %/i%special%i% word in the string."
> If I want to replace any word between the %/i% and %i% what would I do?
>
> I messed with preg_repace but I couldn't understand the pattern system.

What have you tried so far? Do you have any experiences with regular
expressions?

Micha

--
http://mfesser.de/
Fotos | Blog | Flohmarkt

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Re: not understanding pattern matching [message #178611 is a reply to message #178610]

Wed, 11 July 2012 23:11

Michael Joel
Messages: 42
Registered: October 2011

Karma: 0

Member

Michael Fesser wrote:

> .oO(Michael Joel)
>
>
>> I am wanting to change words in a string that has special tags.
>> Ex. "This is a %/i%special%i% word in the string."
>> If I want to replace any word between the %/i% and %i% what would I do?
>>
>> I messed with preg_repace but I couldn't understand the pattern system.
>
>
> What have you tried so far? Do you have any experiences with regular
> expressions?
>
> Micha
>

I have tried many things but all return errors - mostly "unknown modifier".

Mike

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Re: not understanding pattern matching [message #178612 is a reply to message #178610]

Wed, 11 July 2012 23:11

Michael Joel
Messages: 42
Registered: October 2011

Karma: 0

Member

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Re: not understanding pattern matching [message #178613 is a reply to message #178611]

Wed, 11 July 2012 23:26

Michael Fesser
Messages: 215
Registered: September 2010

Karma: 0

Senior Member

.oO(Michael Joel)

> Michael Fesser wrote:
>
>> .oO(Michael Joel)
>>
>>
>>> I am wanting to change words in a string that has special tags.
>>> Ex. "This is a %/i%special%i% word in the string."
>>> If I want to replace any word between the %/i% and %i% what would I do?
>>>
>>> I messed with preg_repace but I couldn't understand the pattern system.
>>
>>
>> What have you tried so far? Do you have any experiences with regular
>> expressions?
>>
>> Micha
>>
>
> I have tried many things but all return errors - mostly "unknown modifier".

Which means syntax error.

Please post your code.

Micha

--
http://mfesser.de/
Fotos | Blog | Flohmarkt

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Re: not understanding pattern matching [message #178614 is a reply to message #178613]

Wed, 11 July 2012 23:31

Michael Joel
Messages: 42
Registered: October 2011

Karma: 0

Member

Michael Fesser wrote:

> .oO(Michael Joel)
>
>
>> Michael Fesser wrote:
>>
>>
>>> .oO(Michael Joel)
>>>
>>>
>>>
>>>> I am wanting to change words in a string that has special tags.
>>>> Ex. "This is a %/i%special%i% word in the string."
>>>> If I want to replace any word between the %/i% and %i% what would I do?
>>>>
>>>> I messed with preg_repace but I couldn't understand the pattern system.
>>>
>>>
>>> What have you tried so far? Do you have any experiences with regular
>>> expressions?
>>>
>>> Micha
>>>
>>
>> I have tried many things but all return errors - mostly "unknown modifier".
>
>
> Which means syntax error.
>
> Please post your code.
>
> Micha
>
I was trying to just first get it to replace the exact thing typed. Then
move on to replacing any word within the %/i% and %i%

$Scripture="this is a %/i%test%i%";
preg_replace("%/i%test%i%","XXXXXXXX",$Scripture);

This errors with Unknown modifier t
I tried what I thought was escaping it by putting a \test but that just
messes up more. See I haven't a clue.

Mike

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Re: not understanding pattern matching [message #178615 is a reply to message #178614]

Thu, 12 July 2012 01:32

BootNic
Messages: 10
Registered: November 2010

Karma: 0

Junior Member

In article <V5KdnVyG6ph9kWPSnZ2dnUVZ_uWdnZ2d(at)earthlink(dot)com>,
Michael Joel <null(at)void(dot)void> wrote:

> Michael Fesser wrote:
>>
>> .oO(Michael Joel)
>>>
>>> Michael Fesser wrote:
>>>>
>>>> .oO(Michael Joel)
>>>> >
>>>> > I am wanting to change words in a string that has special tags.
>>>> > Ex. "This is a %/i%special%i% word in the string."
>>>> > If I want to replace any word between the %/i% and %i% what would I do?
>>>> >
>>>> > I messed with preg_repace but I couldn't understand the pattern system.
>>>>
>>>> What have you tried so far? Do you have any experiences with regular
>>>> expressions?
>>>
>>> I have tried many things but all return errors - mostly "unknown modifier".
>>
>> Which means syntax error.
>>
>> Please post your code.
>
> I was trying to just first get it to replace the exact thing typed. Then
> move on to replacing any word within the %/i% and %i%
>
> $Scripture="this is a %/i%test%i%";
> preg_replace("%/i%test%i%","XXXXXXXX",$Scripture);

http://php.net/manual/en/regexp.reference.delimiters.php

preg_replace("#%/i%test%i%#","XXXXXXXX",$Scripture);

> This errors with Unknown modifier t
> I tried what I thought was escaping it by putting a \test but that just
> messes up more. See I haven't a clue.

--
BootNic Wed Jul 11, 2012 09:32 pm
When I was young, I was put in a school for retarded kids for two years before
they realized I actually had a hearing loss...and they called ME slow!
*Kathy Buckley*

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Re: not understanding pattern matching [message #178616 is a reply to message #178609]

Thu, 12 July 2012 03:27

Michael Joel
Messages: 42
Registered: October 2011

Karma: 0

Member

Michael Joel wrote:
> I am wanting to change words in a string that has special tags.
> Ex. "This is a %/i%special%i% word in the string."
> If I want to replace any word between the %/i% and %i% what would I do?
>
> I messed with preg_repace but I couldn't understand the pattern system.
>
> Mike

Since this function seems to elude me I simply wrote a samll function to
do what I want. I simply pass it the two needles, haystack and what I
want to replace with.

Thanks
Mike

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Re: not understanding pattern matching [message #178620 is a reply to message #178614]

Fri, 13 July 2012 03:22

Denis McMahon
Messages: 634
Registered: September 2010

Karma: 0

Senior Member

On Wed, 11 Jul 2012 19:31:12 -0400, Michael Joel wrote:

> I was trying to just first get it to replace the exact thing typed. Then
> move on to replacing any word within the %/i% and %i%
>
> $Scripture="this is a %/i%test%i%";
> preg_replace("%/i%test%i%","XXXXXXXX",$Scripture);
>
> This errors with Unknown modifier t I tried what I thought was escaping
> it by putting a \test but that just messes up more. See I haven't a
> clue.

http://php.net/manual/en/regexp.reference.delimiters.php

When you use a regex, the first character inside your quotes is taken as
the pattern delimiter.

In your case, this is a "%" character.

The format of a regex string is:

"delimiter pattern delimiter optional-modifiers"

Hence, "%/i%t" is the pattern "/i" with the modifier "t"

Try:

preg_replace("!%/i%test%i%!","XXXXXXXX",$Scripture);

This will use the "!" character as the pattern delimiter and should, in
this specific case, solve your problem. Generally it's a good idea to
pick a pattern delimiter that does not have special meaning to regex and
is not part of your data. This isn't always easy.

Rgds

Denis McMahon

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