Basic functionality of Preg_match in PHP with various scenarios and its example

Hi All,

Basic regexps with preg_match()

syntax:

int preg_match ( string pattern, string subject [, array matches [, int flags [, int offset]]])

preg_match() and takes two parameters: the pattern to match, and the string to match it against.

Preg_match() will apply the regular expression in parameter one to the string in parameter two and see whether it finds a match - if it does, it will return 1, otherwise 0. 

 Regular expressions are formed by starting with a forward slash /, followed by a sequence of special symbols and words to match, then another slash and, optionally, a string of letters that affect the expression.  

Note:

•   The “i” used to find  pattern delimiter indicates a case-insensitive search.

•  The “\b”used to find pattern indicates a word boundary, so only the distinct.

 

<?php
echo "<br>Basic preg_match Functionality <br><br> ";
echo "example 1 for Case Sensitive Search <br>";
if(preg_match("/cool/", "I love to share Cool things that help others.")){
        echo "matched text<br>";
} else {
        echo "Not Matched text<br>";
}

echo "<br> example 2 for Case Insensitive  Search<br>";
if(preg_match("/bala/i", "my name is Balamurugan shortly call has a Bala")){
        echo "name found in text<br>";
}else{
        echo "name is not found in text<br>";
}


echo "<br> example 3 for Word boundary <br>";
if(preg_match("/\bkrishna\b/i",  "Krishna is a god. he kills kamsan in long long ago. and Krishna became king" )){
    echo " krishna name <br>";
}else{
    echo " krishna name not found<br>";
}

echo "<br> example 4 for Found string matched <br>";
if(preg_match("/[Ff]oo/","foo")){
    echo 'string matched<br>';
}  else {
    echo 'String not matched<br>';
}

echo "<br> example 5 for Found string unmatched <br>";
if(preg_match("/[^Ff]oo/","foo")){
    echo 'string matched<br>';
}  else {
    echo 'String not matched<br>';
}

echo "<br> example 6 for Alpha Numeric <br>";
if(preg_match("/[0-9,A-Z,a-z]/","foo")){
    echo 'It is Alphanumeric<br>';
}  else {
    echo 'It is not Alphanumeric<br>';
}

echo "<br> example 7 for Numeric <br>";
if(preg_match("/[0-9]/","foo")){
    echo 'It is Numeric<br>';
}  else {
    echo 'It is not Numeric<br>';
}

echo "<br> example 8 for Lowercase of string <br>";
if(preg_match("/[a-z]/","fo0")){
    echo 'It is Lowercase<br>';
}  else {
    echo 'It is not Lowercase<br>';
}

echo "<br> example 9 for Uppercase of string <br>";
if(preg_match("/[A-Z]/","foo")){
    echo 'It is uppercase<br>';
}  else {
    echo 'It is not Uppercase<br>';
}

echo "<br> example 10 for matched of character in string <br>";
if(preg_match("/[a-w]orld/","aorld")){
    echo 'It is matched<br>';
}  else {
    echo 'It is not matched<br>';
}

echo "<br> example 11 for matched of character & number in string <br>";
if(preg_match("/[a-t]est[0-9][0-9]/","west33")){
    echo 'It is matched<br>';
}  else {
    echo 'It is not matched<br>';
}

echo "<br> example 12 for matched of character & number in string in_casesensitive <br>";
if(preg_match("/[a-t]est[0-9][0-9]/i","West33")){
    echo 'It is matched<br>';
}  else {
    echo 'It is not matched<br>';
}

echo "<br> example 13 for not matched of character & number in string <br>";
if(preg_match("/[^a-t]est[0-9][0-9]/","Best33")){
    echo 'It is matched<br>';
}  else {
    echo 'It is not matched<br>';
}

echo "<br> example 14 for not matched of character & number in string in_casesensitive <br>";
if(preg_match("/[^a-t]est[0-9][0-9]/i","Best33")){
    echo 'It is matched<br>';
}  else {
    echo 'It is not matched<br>';
}

?>

OUTPUT

~~~~~~~~

Basic Preg_Match Functionality

example 1 for Case Sensitive Search
Not Matched text

example 2 for Case Insensitive Search
name found in text

example 3 for Word boundary
krishna name

example 4 for Found string matched
string matched

example 5 for Found string unmatched
String not matched

example 6 for Alpha Numeric
It is Alphanumeric

example 7 for Numeric
It is not Numeric

example 8 for Lowercase of string
It is Lowercase

example 9 for Uppercase of string
It is not Uppercase

example 10 for matched of character in string
It is matched

example 11 for matched of character & number in string
It is not matched

example 12 for matched of character & number in string in_casesensitive
It is not matched

example 13 for not matched of character & number in string
It is matched

example 14 for not matched of character & number in string in_casesensitive
It is not matched