Regular Expressions 101

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/
\bcheck\b|\bcheque\b
/
gi
1st Alternative
\bcheck\b
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
check
matches the characters check literally (case insensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
2nd Alternative
\bcheque\b
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
cheque
matches the characters cheque literally (case insensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
Global pattern flags
g modifier: global. All matches (don't return after first match)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gi

Test String

Code Generator

Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php