How to add additional tag to a specific word using regular expression and php

I want to add into #indlude. i.e if

#include<stdio.h> 

#include<math.h>

int main()

is my target string then it will be :

  <span class="header">#include<stdio.h></span>

  <span class="header">#include<math.h></span>

  int main()

I tried using regular expression as follows:

<?php 

$input = '#include<stdio.h> int main()';

$input = preg_replace('/(#(w)+<(w)+.h>)/','<span class="header">$1</span>',$input);



echo $input;

?>

But no luck. Any idea?

edited Nov 26 '18 at 1:30

asked Nov 25 '18 at 17:36

Abdus Sattar Bhuiyan

1,60821539

5

w is not w, w+ matches wwww. You probably meant to use '/^#include<[^>]+>$/m' and replace with '$0'

– Wiktor Stribiżew
Nov 25 '18 at 17:46

Note that you should html encode '<' and '>' around <stdio.h>

– Poul Bak
Nov 25 '18 at 18:06

Also, in your current regex . matches any character. You need to use . to match a ..

– Nick
Nov 25 '18 at 22:59

add a comment |

I want to add into #indlude. i.e if

#include<stdio.h> 

#include<math.h>

int main()

is my target string then it will be :

  <span class="header">#include<stdio.h></span>

  <span class="header">#include<math.h></span>

  int main()

I tried using regular expression as follows:

<?php 

$input = '#include<stdio.h> int main()';

$input = preg_replace('/(#(w)+<(w)+.h>)/','<span class="header">$1</span>',$input);



echo $input;

?>

But no luck. Any idea?

edited Nov 26 '18 at 1:30

asked Nov 25 '18 at 17:36

Abdus Sattar Bhuiyan

1,60821539

5

w is not w, w+ matches wwww. You probably meant to use '/^#include<[^>]+>$/m' and replace with '$0'

– Wiktor Stribiżew
Nov 25 '18 at 17:46

Note that you should html encode '<' and '>' around <stdio.h>

– Poul Bak
Nov 25 '18 at 18:06

Also, in your current regex . matches any character. You need to use . to match a ..

– Nick
Nov 25 '18 at 22:59

add a comment |

I want to add into #indlude. i.e if

#include<stdio.h> 

#include<math.h>

int main()

is my target string then it will be :

  <span class="header">#include<stdio.h></span>

  <span class="header">#include<math.h></span>

  int main()

I tried using regular expression as follows:

<?php 

$input = '#include<stdio.h> int main()';

$input = preg_replace('/(#(w)+<(w)+.h>)/','<span class="header">$1</span>',$input);



echo $input;

?>

But no luck. Any idea?

edited Nov 26 '18 at 1:30

asked Nov 25 '18 at 17:36

Abdus Sattar Bhuiyan

1,60821539

I want to add into #indlude. i.e if

#include<stdio.h> 

#include<math.h>

int main()

is my target string then it will be :

  <span class="header">#include<stdio.h></span>

  <span class="header">#include<math.h></span>

  int main()

I tried using regular expression as follows:

<?php 

$input = '#include<stdio.h> int main()';

$input = preg_replace('/(#(w)+<(w)+.h>)/','<span class="header">$1</span>',$input);



echo $input;

?>

But no luck. Any idea?

php regex

edited Nov 26 '18 at 1:30

asked Nov 25 '18 at 17:36

Abdus Sattar Bhuiyan

1,60821539

edited Nov 26 '18 at 1:30

asked Nov 25 '18 at 17:36

Abdus Sattar Bhuiyan

1,60821539

edited Nov 26 '18 at 1:30

asked Nov 25 '18 at 17:36

Abdus Sattar Bhuiyan

1,60821539

asked Nov 25 '18 at 17:36

Abdus Sattar Bhuiyan

1,60821539

asked Nov 25 '18 at 17:36

Abdus Sattar Bhuiyan

1,60821539

5

w is not w, w+ matches wwww. You probably meant to use '/^#include<[^>]+>$/m' and replace with '$0'

– Wiktor Stribiżew
Nov 25 '18 at 17:46

Note that you should html encode '<' and '>' around <stdio.h>

– Poul Bak
Nov 25 '18 at 18:06

Also, in your current regex . matches any character. You need to use . to match a ..

– Nick
Nov 25 '18 at 22:59

add a comment |

5

w is not w, w+ matches wwww. You probably meant to use '/^#include<[^>]+>$/m' and replace with '$0'

– Wiktor Stribiżew
Nov 25 '18 at 17:46

Note that you should html encode '<' and '>' around <stdio.h>

– Poul Bak
Nov 25 '18 at 18:06

Also, in your current regex . matches any character. You need to use . to match a ..

– Nick
Nov 25 '18 at 22:59

w is not w, w+ matches wwww. You probably meant to use '/^#include<[^>]+>$/m' and replace with '$0'

– Wiktor Stribiżew
Nov 25 '18 at 17:46

Note that you should html encode '<' and '>' around <stdio.h>

– Poul Bak
Nov 25 '18 at 18:06

Also, in your current regex . matches any character. You need to use . to match a ..

– Nick
Nov 25 '18 at 22:59

add a comment |

1 Answer
1

active

oldest

votes

Unless you state otherwise, you don't need any capture groups or start of line anchors; just replace the fullstring match ($0)

Code: (Demo)

$string = <<<STRING

#include<math.h>

#include<stdio.h>



int main()

STRING;



echo preg_replace('~#include<[^>]+>~', '<span class="header">$0</span>', $string);

Output:

<span class="header">#include<math.h></span>

<span class="header">#include<stdio.h></span>



int main()

The negated character class ([^>]) will greedily match all characters between < and > -- this is preferable as a matter of pattern efficiency.

answered Nov 26 '18 at 3:15

mickmackusa

23.4k103658

Huh, I didn't know that $0 matches the whole string. Have an upvote :)

– Davіd
Nov 26 '18 at 3:22

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

Unless you state otherwise, you don't need any capture groups or start of line anchors; just replace the fullstring match ($0)

Code: (Demo)

$string = <<<STRING

#include<math.h>

#include<stdio.h>



int main()

STRING;



echo preg_replace('~#include<[^>]+>~', '<span class="header">$0</span>', $string);

Output:

<span class="header">#include<math.h></span>

<span class="header">#include<stdio.h></span>



int main()

The negated character class ([^>]) will greedily match all characters between < and > -- this is preferable as a matter of pattern efficiency.

answered Nov 26 '18 at 3:15

mickmackusa

23.4k103658

Huh, I didn't know that $0 matches the whole string. Have an upvote :)

– Davіd
Nov 26 '18 at 3:22

add a comment |

Unless you state otherwise, you don't need any capture groups or start of line anchors; just replace the fullstring match ($0)

Code: (Demo)

$string = <<<STRING

#include<math.h>

#include<stdio.h>



int main()

STRING;



echo preg_replace('~#include<[^>]+>~', '<span class="header">$0</span>', $string);

Output:

<span class="header">#include<math.h></span>

<span class="header">#include<stdio.h></span>



int main()

The negated character class ([^>]) will greedily match all characters between < and > -- this is preferable as a matter of pattern efficiency.

answered Nov 26 '18 at 3:15

mickmackusa

23.4k103658

Huh, I didn't know that $0 matches the whole string. Have an upvote :)

– Davіd
Nov 26 '18 at 3:22

add a comment |

Unless you state otherwise, you don't need any capture groups or start of line anchors; just replace the fullstring match ($0)

Code: (Demo)

$string = <<<STRING

#include<math.h>

#include<stdio.h>



int main()

STRING;



echo preg_replace('~#include<[^>]+>~', '<span class="header">$0</span>', $string);

Output:

<span class="header">#include<math.h></span>

<span class="header">#include<stdio.h></span>



int main()

The negated character class ([^>]) will greedily match all characters between < and > -- this is preferable as a matter of pattern efficiency.

answered Nov 26 '18 at 3:15

mickmackusa

23.4k103658

Unless you state otherwise, you don't need any capture groups or start of line anchors; just replace the fullstring match ($0)

Code: (Demo)

$string = <<<STRING

#include<math.h>

#include<stdio.h>



int main()

STRING;



echo preg_replace('~#include<[^>]+>~', '<span class="header">$0</span>', $string);

Output:

<span class="header">#include<math.h></span>

<span class="header">#include<stdio.h></span>



int main()

The negated character class ([^>]) will greedily match all characters between < and > -- this is preferable as a matter of pattern efficiency.

answered Nov 26 '18 at 3:15

mickmackusa

23.4k103658

answered Nov 26 '18 at 3:15

mickmackusa

23.4k103658

answered Nov 26 '18 at 3:15

mickmackusa

23.4k103658

answered Nov 26 '18 at 3:15

mickmackusa

23.4k103658

Huh, I didn't know that $0 matches the whole string. Have an upvote :)

– Davіd
Nov 26 '18 at 3:22

add a comment |

Huh, I didn't know that $0 matches the whole string. Have an upvote :)

– Davіd
Nov 26 '18 at 3:22

Huh, I didn't know that $0 matches the whole string. Have an upvote :)

– Davіd
Nov 26 '18 at 3:22

add a comment |

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