slds- grid system

 <!-- RESPONSIVE GRID  -->
<div class="slds-grid slds-wrap">
  <div class="slds-col slds-size--1-of-1 slds-small-size--1-of-1 slds-medium-size--1-of-1">     
     
    </div>
</div>




Reference:
        https://trailhead.salesforce.com/en/modules/lightning_design_system/units/lightning-design-system3

salesforce - Remove all special characters from the given string.

String s1 = '$!(5-14)';
String regExp = '[^a-zA-Z0-9-]';
String replacement = '';
String s2 = s1.replaceAll(regExp, replacement);
System.assertEquals('5-14', s2);
System.debug('s2: '+s2);
String[] parts=s2.split('-');
for(Integer i=0;i<parts.size();i++){
 System.debug('Part-'+(i+1)+'= '+parts[i]);
}