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Added more substring checks

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Dylan Araps
2018-06-15 16:59:40 +10:00
parent f3a113f370
commit 0185f6dcab
1 changed files with 32 additions and 5 deletions
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37
README.md
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@@ -52,7 +52,9 @@ scripts and not full blown utilities.
* [Strip first occurrence of pattern from string.](#strip-first-occurrence-of-pattern-from-string) * [Strip first occurrence of pattern from string.](#strip-first-occurrence-of-pattern-from-string)
* [Strip pattern from start of string.](#strip-pattern-from-start-of-string) * [Strip pattern from start of string.](#strip-pattern-from-start-of-string)
* [Strip pattern from end of string.](#strip-pattern-from-end-of-string) * [Strip pattern from end of string.](#strip-pattern-from-end-of-string)
* [Check if string contains a substring.](#check-if-string-contains-a-substring) * [Check if string contains a sub-string.](#check-if-string-contains-a-sub-string)
* [Check if string starts with sub-string.](#check-if-string-starts-with-sub-string)
* [Check if string ends with sub-string.](#check-if-string-ends-with-sub-string)
* [Variables](#variables) * [Variables](#variables)
* [Assign and access a variable using a variable.](#assign-and-access-a-variable-using-a-variable) * [Assign and access a variable using a variable.](#assign-and-access-a-variable-using-a-variable)
* [Arrays](#arrays) * [Arrays](#arrays)
@@ -398,19 +400,18 @@ $ rstrip "The Quick Brown Fox" " Fox"
The Quick Brown The Quick Brown
``` ```
## Check if string contains a substring. ## Check if string contains a sub-string.
**Using a test:** **Using a test:**
```shell ```shell
# Normal
if [[ "$var" == *sub_string* ]]; then if [[ "$var" == *sub_string* ]]; then
printf '%s\n' "sub_string is in var" printf '%s\n' "sub_string is in var."
fi fi
# Inverse (substring not in string). # Inverse (substring not in string).
if [[ "$var" != *sub_string* ]]; then if [[ "$var" != *sub_string* ]]; then
printf '%s\n' "sub_string is not in var" printf '%s\n' "sub_string is not in var."
fi fi
# This works for arrays too! # This works for arrays too!
@@ -419,6 +420,32 @@ if [[ "${arr[*]}" == *sub_string* ]]; then
fi fi
``` ```
## Check if string starts with sub-string.
```shell
if [[ "$var" == sub_string* ]]; then
printf '%s\n' "var starts with sub_string."
fi
# Inverse (var doesn't start with sub_string).
if [[ "$var" != sub_string* ]]; then
printf '%s\n' "var does not start with sub_string."
fi
```
## Check if string ends with sub-string.
```shell
if [[ "$var" == *sub_string ]]; then
printf '%s\n' "var ends with sub_string."
fi
# Inverse (var doesn't start with sub_string).
if [[ "$var" != *sub_string ]]; then
printf '%s\n' "var does not end with sub_string."
fi
```
**Using a case statement:** **Using a case statement:**
```shell ```shell