I have a string like
string = ionworldionfriendsionPeople
How can I split it and store in to array based on the pattern ion as
array[0]=ionworld
array[1]=ionfriends
array[2]=ionPeople
I tried IFS but I am unable to split correctly. Can any one help on this.
Edit: I tried
test=ionworldionfriendsionPeople
IFS='ion' read -ra array <<< "$test"
Also my string may sometimes contains spaces like
string = ionwo rldionfri endsionPeo ple
You can use some POSIX parameter expansion operators to build up the array in reverse order.
foo=ionworldionfriendsionPeople
tmp="$foo"
while [[ -n $tmp ]]; do
# tail is set to the result of dropping the shortest suffix
# matching ion*
tail=${tmp%ion*}
# Drop everything from tmp matching the tail, then prepend
# the result to the array
array=("${tmp#$tail}" "${array[@]}")
# Repeat with the tail, until its empty
tmp="$tail"
done
The result is
$ printf '%s\n' "${array[@]}"
ionworld
ionfriends
ionPeople
If your input string never contains whitespace, you can use parameter expansion:
#! /bin/bash
string=ionworldionfriendsionPeople
array=(${string//ion/ })
for m in "${array[@]}" ; do
echo ion"$m"
done
If the string contains whitespace, find another character and use it:
ifs=$IFS
IFS=@
array=(${string//ion/@})
IFS=$ifs
You'll need to skip the first element in the array which will be empty, though.
Using grep -oP with lookahead regex:
s='ionworldionfriendsionPeople'
grep -oP 'ion.*?(?=ion|$)' <<< "$s"
Will give output:
ionworld
ionfriends
ionPeople
To populate an array:
arr=()
while read -r; do
arr+=("$REPLY")
done < <(grep -oP 'ion.*?(?=ion|$)' <<< "$s")
Check array content:
declare -p arr
declare -a arr='([0]="ionworld" [1]="ionfriends" [2]="ionPeople")'
If your grep doesn't support -P (PCRE) then you can use this gnu-awk:
awk -v RS='ion' 'RT{p=RT} $1!=""{print p $1}' <<< "$s"
Output:
ionworld
ionfriends
ionPeople
# To split string :
# -----------------
string=ionworldionfriendsionPeople
echo "$string" | sed -e "s/\(.\)ion/\1\nion/g"
# To set in Array:
# ----------------
string=ionworldionfriendsionPeople
array=(`echo "$string" | sed -e "s/\(.\)ion/\1 ion/g"`)
# To check array content :
# ------------------------
echo ${array[*]}
