PROGRAMMING

  minte9
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S R Q

Word boundaries

p15 A regex that match a word can also match it embedded within a larger word.
 
#!/bin/sh

: "Word boundaries, a common problem:
A regex that match a word can also match it embedded 
Use \b and \b
Use \< and \>
"

A='gray grayscale'
B='cat category'
C='doggy dog'

echo $A | grep 'gray'         -o | tee result.txt
echo $B | grep '\b(cat)\b' -E -o | tee result.txt -a
echo $C | grep '\<dog\>'   -E -o | tee result.txt -a
 
gray
gray
cat
dog

Questions    
Last update: 57 days ago
Grep, Optional