search and color 'characters' in a string, help needed

[ivytony]

I have a sequence that contains many amino acids (e.g. MATQSTDPEGTGSTTS.....), and I want to find both 'ST' and 'TS' in the sequence. I also want to print out the sequence with 'ST' and 'TS' highlighted in color and report the total number of the 'ST' and 'TS' sites found.

 

pls help me a bit to start coding.

 

thanks!

[Zane]

str_replace ?

[ivytony]

but I also want to count the occurrences in the sequence string.

[ignace]

$count = 0;
$text = str_replace($search, $replace, $text, $count);

 

Read the manual and learn.

[ivytony]

thanks, I think str_replace works!

 

I also need to search for "SP" and "TP" sites in the protein sequence, how to do the search more efficiently? I want to equalize "S" with "T" in the search.

[ignace]

$search = array(
  'ST' => '',
  'TS' => '',
  'SP' => '',
  'TP' => ''
);

$count = 0;
$text = str_replace(array_keys($search), array_values($search), $text, $count);