Example #1 Examples of valid patterns
/<\/\w+>/|(\d{3})-\d+|Sm/^(?i)php[34]/{^\s+(\s+)?$}
Example #2 Examples of invalid patterns
/href='(.*)' - missing ending delimiter
/\w+\s*\w+/J - unknown modifier 'J'
1-\d3-\d3-\d4| - missing starting delimiter