15
A long time ago, I took a look at the use of Boundary, studying about regular expressions in PHP (PCRE Patterns).
I came across the \b
(which is called Boundary).
What is the use of it in a regular expression?
15
A long time ago, I took a look at the use of Boundary, studying about regular expressions in PHP (PCRE Patterns).
I came across the \b
(which is called Boundary).
What is the use of it in a regular expression?
23
The \b
(beta) is an anchor just like his cousins ^
(alpha) and $
(omega). Once added on one side of the regex will capture pattern specified at start, end or word is valid only for letters, numbers and the underline ([A-Za-z0-9_]
) which is the equivalent of \w
.
Entree:
dialogo dia melodia diafragma dialeto radial bom-dia
At first \bdia
capture strings(words) that contain at the beginning(not the beginning of the line) the pattern dia
, the items entering the capture are, daysoon, day, dayfragma, dayLithium and good-day
Anchor at the end dia\b
captures strings(words) where the specified pattern is at the end, the captured items are: day, Meloday and good-day
Anchor \bdia\b
capture strings(words) extas day and good-day
References
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