我基本上需要在最后一个管道之后得到一点
"3083505|07733366638|3"
这个正则表达式是什么？
答案 0 :(得分：6)
您可以在没有正则表达式的情况下执行此操作。这里：
"3083505|07733366638|3".split("|").last
# => "3"
使用正则表达式:(假设它总是为整数值）
"3083505|07733366638|3".scan(/\|(\d+)$/)[0][0] # or use \w+ if you want to extract any word after `|`
# => "3"
答案 1 :(得分：2)
试试这个正则表达式：
.*\|(.*)
它返回 最后| 之后的所有内容。
答案 2 :(得分：1)
我会使用split和last，但您可以
last_field = line.sub(/.+\|/, "")
删除所有字符，包括最后一个管道。
答案 3 :(得分：1)
您可以使用String#rindex
轻松完成此操作r = /
.* # match any number of any character (greedily!)
\| # match pipe
(.+) # match one or more characters in capture group 1
/x # extended mode
line[r,1]
#=> "37"
如果你坚持使用正则表达式：
r = /
.* # match any number of any character (greedily!)
\| # match pipe
\K # forget everything matched so far
.+ # match one or more characters
/x # extended mode
line[r]
#=> "37"
可替换地：
r = /
(?<=\|) # match a pipe in a positive lookbehind
\d+ # match any number of digits
\z # match end of string
/x # extended mode
line[r]
#=> "37"
或者，正如@engineersmnky在评论@ shivam的答案时所建议的那样：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test/com.test.activities.SplashActivity}: android.view.InflateException: Binary XML file line #10: Error inflating class com.test.ui.shimmer.ShimmerTextView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2447)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2507)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5692)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class com.test.ui.shimmer.ShimmerTextView
at android.view.LayoutInflater.createView(LayoutInflater.java:626)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:702)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:350)
at android.app.Activity.setContentView(Activity.java:2059)
at com.framework.base.fragment.base.MCFragmentActivity.setContentView(MCFragmentActivity.java:160)
at com.test.activities.SplashActivity.setOrientation(SplashActivity.java:50)
at com.test.activities.SplashActivity.onCreate(SplashActivity.java:42)
at android.app.Activity.performCreate(Activity.java:5541)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2411)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2507)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5692)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at android.view.LayoutInflater.createView(LayoutInflater.java:600)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:702)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:350)
at android.app.Activity.setContentView(Activity.java:2059)
at com.framework.base.fragment.base.MCFragmentActivity.setContentView(MCFragmentActivity.java:160)
at com.test.activities.SplashActivity.setOrientation(SplashActivity.java:50)
at com.test.activities.SplashActivity.onCreate(SplashActivity.java:42)
at android.app.Activity.performCreate(Activity.java:5541)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2411)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2507)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5692)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NoClassDefFoundError: com.test.ui.shimmer.ShimmerViewHelper
at com.test.ui.shimmer.ShimmerTextView.<init>(ShimmerTextView.java:33)
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at android.view.LayoutInflater.createView(LayoutInflater.java:600)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:702)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:350)
at android.app.Activity.setContentView(Activity.java:2059)
at com.framework.base.fragment.base.MCFragmentActivity.setContentView(MCFragmentActivity.java:160)
at com.test.activities.SplashActivity.setOrientation(SplashActivity.java:50)
at com.test.activities.SplashActivity.onCreate(SplashActivity.java:42)
at android.app.Activity.performCreate(Activity.java:5541)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2411)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2507)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5692)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)